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Aeon Chronicler
Aeon Chronicler 3BlueBlue (5)
Creature — Avatar (*/*)

Aeon Chronicler's power and toughness are each equal to the number of cards in your hand.

Suspend X—Variable Colorless3Blue. X can't be 0. (Rather than cast this card from your hand, you may pay Variable Colorless3Blue and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Aeon Chronicler while it's exiled, draw a card.

Commander 2016 (Rare)
Other Versions
Planar Chaos (Rare)
Duel Decks: Jace vs. Vraska (Rare)
Aladdin's Lamp
Aladdin's Lamp 10 (10)
Artifact

Variable Colorless, Tap: The next time you would draw a card this turn, instead look at the top X cards of your library, put all but one of them on the bottom of your library in a random order, then draw a card. X can't be 0.

Arabian Nights (Rare)
Other Versions
Revised Edition (Rare)
Fourth Edition (Rare)
Alexi, Zephyr Mage
Alexi, Zephyr Mage 3BlueBlue (5)
Legendary Creature — Human Spellshaper (3/3)

Variable ColorlessBlue, Tap, Discard two cards: Return X target creatures to their owners' hands.

Prophecy (Rare)
Anthroplasm
Anthroplasm 2BlueBlue (4)
Creature — Shapeshifter (0/0)

Anthroplasm enters the battlefield with two +1/+1 counters on it.

Variable Colorless, Tap: Remove all +1/+1 counters from Anthroplasm and put X +1/+1 counters on it.

Urza's Legacy (Rare)
Arashi, the Sky Asunder
Arashi, the Sky Asunder 3GreenGreen (5)
Legendary Creature — Spirit (5/5)

Variable ColorlessGreen, Tap: Arashi, the Sky Asunder deals X damage to target creature with flying.

Channel — Variable ColorlessGreenGreen, Discard Arashi: Arashi deals X damage to each creature with flying.

Saviors of Kamigawa (Rare)
Arcum's Whistle
Arcum's Whistle 3 (3)
Artifact

3, Tap: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay Variable Colorless, where X is that creature's converted mana cost. If they don't pay, the creature attacks this turn if able, and at the beginning of the next end step, destroy it if it didn't attack this turn. Activate this ability only before attackers are declared.

Ice Age (Uncommon)
Atalya, Samite Master
Atalya, Samite Master 3WhiteWhite (5)
Legendary Creature — Human Cleric (2/3)

Variable Colorless, Tap: Choose one —

• Prevent the next X damage that would be dealt to target creature this turn. Spend only white mana on X.

• You gain X life. Spend only white mana on X.

Invasion (Rare)
Avacyn's Judgment
Avacyn's Judgment 1Red (2)
Sorcery

Madness Variable ColorlessRed (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Avacyn's Judgment deals 2 damage divided as you choose among any number of targets. If Avacyn's Judgment's madness cost was paid, it deals X damage divided as you choose among those permanents and/or players instead.

Shadows over Innistrad (Rare)
Azor, the Lawbringer
Azor, the Lawbringer 2WhiteWhiteBlueBlue (6)
Legendary Creature — Sphinx (6/6)

Flying

When Azor, the Lawbringer enters the battlefield, each opponent can't cast instant or sorcery spells during that player's next turn.

Whenever Azor attacks, you may pay Variable ColorlessWhiteBlueBlue. If you do, you gain X life and draw X cards.

Rivals of Ixalan (Mythic Rare)
Ballista Squad
Ballista Squad 3White (4)
Creature — Human Rebel (2/2)

Variable ColorlessWhite, Tap: Ballista Squad deals X damage to target attacking or blocking creature.

Tenth Edition (Uncommon)
Other Versions
Ninth Edition (Uncommon)
Mercadian Masques (Uncommon)
Bane of the Living
Bane of the Living 2BlackBlack (4)
Creature — Insect (4/3)

Morph Variable ColorlessBlackBlack (You may cast this card face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)

When Bane of the Living is turned face up, all creatures get -X/-X until end of turn.

Commander Anthology 2018 (Rare)
Other Versions
Legions (Rare)
Commander 2016 (Rare)
Banshee
Banshee 2BlackBlack (4)
Creature — Spirit (0/1)

Variable Colorless, Tap: Banshee deals half X damage, rounded down, to any target, and half X damage, rounded up, to you.

Masters Edition III (Uncommon)
Other Versions
The Dark (Uncommon)
Chronicles (Uncommon)
Bargaining Table
Bargaining Table 5 (5)
Artifact

Variable Colorless, Tap: Draw a card. X is the number of cards in an opponent's hand.

Mercadian Masques (Rare)
Belbe's Armor
Belbe's Armor 3 (3)
Artifact

Variable Colorless, Tap: Target creature gets -X/+X until end of turn.

Nemesis (Uncommon)
Benalish Commander
Benalish Commander 3White (4)
Creature — Human Soldier (*/*)

Benalish Commander's power and toughness are each equal to the number of Soldiers you control.

Suspend X—Variable ColorlessWhiteWhite. X can't be 0. (Rather than cast this card from your hand, you may pay Variable ColorlessWhiteWhite and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Benalish Commander while it's exiled, create a 1/1 white Soldier creature token.

Planar Chaos (Rare)
Bludgeon Brawl
Bludgeon Brawl 2Red (3)
Enchantment

Each noncreature, non-Equipment artifact is an Equipment with equip Variable Colorless and "Equipped creature gets +X/+0," where X is that artifact's converted mana cost.

New Phyrexia (Rare)
Bonfire of the Damned
Bonfire of the Damned Variable ColorlessVariable ColorlessRed (1)
Sorcery

Bonfire of the Damned deals X damage to target player or planeswalker and each creature that player or that planeswalker's controller controls.

Miracle Variable ColorlessRed (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Modern Masters 2017 Edition (Mythic Rare)
Other Versions
Avacyn Restored (Mythic Rare)
Broken Ambitions
Broken Ambitions Variable ColorlessBlue (1)
Instant

Counter target spell unless its controller pays Variable Colorless. Clash with an opponent. If you win, that spell's controller puts the top four cards of their library into their graveyard. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher converted mana cost.)

Lorwyn (Common)
Cabal Interrogator
Cabal Interrogator 1Black (2)
Creature — Zombie Wizard (1/1)

Variable ColorlessBlack, Tap: Target player reveals X cards from their hand and you choose one of them. That player discards that card. Activate this ability only any time you could cast a sorcery.

Scourge (Uncommon)
Cackling Witch
Cackling Witch 1Black (2)
Creature — Human Spellshaper (1/1)

Variable ColorlessBlack, Tap, Discard a card: Target creature gets +X/+0 until end of turn.

Mercadian Masques (Uncommon)
Caller of the Untamed
Caller of the Untamed 3Green (4)
Creature — Elf Shaman (2/4)

Before you shuffle your deck to start the game, you may reveal this card from your deck and exile a creature card you drafted that isn't in your deck.

Variable Colorless, Tap: Create a token that's a copy of a card you exiled with cards named Caller of the Untamed. X is the converted mana cost of that card.

Conspiracy: Take the Crown (Rare)
Candelabra of Tawnos
Candelabra of Tawnos 1 (1)
Artifact

Variable Colorless, Tap: Untap X target lands.

Masters Edition IV (Rare)
Other Versions
Antiquities (Rare)
Cephalid Shrine
Cephalid Shrine 1BlueBlue (3)
Enchantment

Whenever a player casts a spell, counter that spell unless that player pays Variable Colorless, where X is the number of cards in all graveyards with the same name as the spell.

Odyssey (Rare)
Chamber Sentry
Chamber Sentry Variable Colorless (0)
Artifact Creature — Construct (0/0)

Chamber Sentry enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.

Variable Colorless, Tap, Remove X +1/+1 counters from Chamber Sentry: It deals X damage to any target.

WhiteBlueBlackRedGreen: Return Chamber Sentry from your graveyard to your hand.

Guilds of Ravnica (Rare)
Chimeric Coils
Chimeric Coils 1 (1)
Artifact

Variable Colorless1: Chimeric Coils becomes an X/X Construct artifact creature. Sacrifice it at the beginning of the next end step.

Fifth Dawn (Uncommon)
Chimeric Staff
Chimeric Staff 4 (4)
Artifact

Variable Colorless: Chimeric Staff becomes an X/X Construct artifact creature until end of turn.

Tenth Edition (Rare)
Other Versions
Urza's Saga (Rare)
Chromatic Armor
Chromatic Armor 1WhiteBlue (3)
Enchantment — Aura

Enchant creature

As Chromatic Armor enters the battlefield, choose a color.

Chromatic Armor enters the battlefield with a sleight counter on it.

Prevent all damage that would be dealt to enchanted creature by sources of the last chosen color.

Variable Colorless: Put a sleight counter on Chromatic Armor and choose a color. X is the number of sleight counters on Chromatic Armor.

Ice Age (Rare)
Cinder Elemental
Cinder Elemental 3Red (4)
Creature — Elemental (2/2)

Variable ColorlessRed, Tap, Sacrifice Cinder Elemental: Cinder Elemental deals X damage to any target.

Gatecrash (Uncommon)
Other Versions
Mercadian Masques (Uncommon)
Planechase (Uncommon)
Citanul Flute
Citanul Flute 5 (5)
Artifact

Variable Colorless, Tap: Search your library for a creature card with converted mana cost X or less, reveal it, and put it into your hand. Then shuffle your library.

Tenth Edition (Rare)
Other Versions
Urza's Saga (Rare)
Clash of Wills
Clash of Wills Variable ColorlessBlue (1)
Instant

Counter target spell unless its controller pays Variable Colorless.

Magic Origins (Uncommon)
Clockwork Avian
Clockwork Avian 5 (5)
Artifact Creature — Bird (0/4)

Flying

Clockwork Avian enters the battlefield with four +1/+0 counters on it.

At end of combat, if Clockwork Avian attacked or blocked this combat, remove a +1/+0 counter from it.

Variable Colorless, Tap: Put up to X +1/+0 counters on Clockwork Avian. This ability can't cause the total number of +1/+0 counters on Clockwork Avian to be greater than four. Activate this ability only during your upkeep.

Masters Edition IV (Uncommon)
Other Versions
Fourth Edition (Rare)
Antiquities (Rare)
Beatdown Box Set (Rare)
Clockwork Beast
Clockwork Beast 6 (6)
Artifact Creature — Beast (0/4)

Clockwork Beast enters the battlefield with seven +1/+0 counters on it.

At end of combat, if Clockwork Beast attacked or blocked this combat, remove a +1/+0 counter from it.

Variable Colorless, Tap: Put up to X +1/+0 counters on Clockwork Beast. This ability can't cause the total number of +1/+0 counters on Clockwork Beast to be greater than seven. Activate this ability only during your upkeep.

Masters Edition (Uncommon)
Other Versions
Limited Edition Alpha (Rare)
Limited Edition Beta (Rare)
Unlimited Edition (Rare)
Revised Edition (Rare)
Fourth Edition (Rare)
Fifth Edition (Rare)
Beatdown Box Set (Rare)
Clockwork Steed
Clockwork Steed 4 (4)
Artifact Creature — Horse (0/3)

Clockwork Steed enters the battlefield with four +1/+0 counters on it.

Clockwork Steed can't be blocked by artifact creatures.

At end of combat, if Clockwork Steed attacked or blocked this combat, remove a +1/+0 counter from it.

Variable Colorless, Tap: Put up to X +1/+0 counters on Clockwork Steed. This ability can't cause the total number of +1/+0 counters on Clockwork Steed to be greater than four. Activate this ability only during your upkeep.

Masters Edition II (Uncommon)
Other Versions
Fifth Edition (Uncommon)
Homelands (Common)
Clockwork Swarm
Clockwork Swarm 4 (4)
Artifact Creature — Insect (0/3)

Clockwork Swarm enters the battlefield with four +1/+0 counters on it.

Clockwork Swarm can't be blocked by Walls.

At end of combat, if Clockwork Swarm attacked or blocked this combat, remove a +1/+0 counter from it.

Variable Colorless, Tap: Put up to X +1/+0 counters on Clockwork Swarm. This ability can't cause the total number of +1/+0 counters on Clockwork Swarm to be greater than four. Activate this ability only during your upkeep.

Masters Edition IV (Common)
Other Versions
Homelands (Common)
Collective Restraint
Collective Restraint 3Blue (4)
Enchantment

Domain — Creatures can't attack you unless their controller pays Variable Colorless for each creature they control that's attacking you, where X is the number of basic land types among lands you control.

Invasion (Rare)
Condescend
Condescend Variable ColorlessBlue (1)
Instant

Counter target spell unless its controller pays Variable Colorless. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Iconic Masters (Uncommon)
Other Versions
Fifth Dawn (Common)
Duel Decks: Jace vs. Chandra (Common)
Duel Decks Anthology, Jace vs. Chandra (Common)
Crimson Hellkite
Crimson Hellkite 6RedRedRed (9)
Creature — Dragon (6/6)

Flying

Variable Colorless, Tap: Crimson Hellkite deals X damage to target creature. Spend only red mana on X.

Mirage (Rare)
Other Versions
Classic Sixth Edition (Rare)
Seventh Edition (Rare)
Crypt Rats
Crypt Rats 2Black (3)
Creature — Rat (1/1)

Variable Colorless: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

Visions (Common)
Other Versions
Seventh Edition (Uncommon)
Decree of Justice
Decree of Justice Variable ColorlessVariable Colorless2WhiteWhite (4)
Sorcery

Create X 4/4 white Angel creature tokens with flying.

Cycling 2White (2White, Discard this card: Draw a card.)

When you cycle Decree of Justice, you may pay Variable Colorless. If you do, create X 1/1 white Soldier creature tokens.

Masters 25 (Rare)
Other Versions
Scourge (Rare)
Vintage Masters (Rare)
Commander 2014 (Rare)
Duel Decks: Elspeth vs. Kiora (Rare)
Deepfire Elemental
Deepfire Elemental 4BlackRed (6)
Creature — Elemental (4/4)

Variable ColorlessVariable Colorless1: Destroy target artifact or creature with converted mana cost X.

Commander 2013 Edition (Uncommon)
Other Versions
Coldsnap (Uncommon)
Deepwood Elder
Deepwood Elder GreenGreen (2)
Creature — Dryad Spellshaper (2/2)

Variable ColorlessGreenGreen, Tap, Discard a card: X target lands become Forests until end of turn.

Mercadian Masques (Rare)
Demonspine Whip
Demonspine Whip BlackRed (2)
Artifact — Equipment

Variable Colorless: Equipped creature gets +X/+0 until end of turn.

Equip 1

Alara Reborn (Uncommon)
Depala, Pilot Exemplar
Depala, Pilot Exemplar 1RedWhite (3)
Legendary Creature — Dwarf Pilot (3/3)

Other Dwarves you control get +1/+1.

Each Vehicle you control gets +1/+1 as long as it's a creature.

Whenever Depala, Pilot Exemplar becomes tapped, you may pay Variable Colorless. If you do, reveal the top X cards of your library, put all Dwarf and Vehicle cards from among them into your hand, then put the rest on the bottom of your library in a random order.

Kaladesh (Rare)
Detritivore
Detritivore 2RedRed (4)
Creature — Lhurgoyf (*/*)

Detritivore's power and toughness are each equal to the number of nonbasic land cards in your opponents' graveyards.

Suspend X—Variable Colorless3Red. X can't be 0. (Rather than cast this card from your hand, you may pay Variable Colorless3Red and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Detritivore while it's exiled, destroy target nonbasic land.

Planar Chaos (Rare)
Devil's Play
Devil's Play Variable ColorlessRed (1)
Sorcery

Devil's Play deals X damage to any target.

Flashback Variable ColorlessRedRedRed (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Duel Decks: Sorin vs. Tibalt (Rare)
Other Versions
Innistrad (Rare)
Domesticated Hydra
Domesticated Hydra 2GreenGreen (4)
Creature — Hydra (3/3)

Variable ColorlessGreenGreenGreen: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)

As long as Domesticated Hydra is monstrous, it has trample.

Conspiracy: Take the Crown (Uncommon)
Drana, Kalastria Bloodchief
Drana, Kalastria Bloodchief 3BlackBlack (5)
Legendary Creature — Vampire Shaman (4/4)

Flying

Variable ColorlessBlackBlack: Target creature gets -0/-X until end of turn and Drana, Kalastria Bloodchief gets +X/+0 until end of turn.

Commander 2017 (Rare)
Other Versions
Rise of the Eldrazi (Rare)
Commander 2014 (Rare)
Droning Bureaucrats
Droning Bureaucrats 3White (4)
Creature — Human Advisor (1/4)

Variable Colorless, Tap: Each creature with converted mana cost X can't attack or block this turn.

Guildpact (Uncommon)
Elite Arcanist
Elite Arcanist 3Blue (4)
Creature — Human Wizard (1/1)

When Elite Arcanist enters the battlefield, you may exile an instant card from your hand.

Variable Colorless, Tap: Copy the exiled card. You may cast the copy without paying its mana cost. X is the converted mana cost of the exiled card.

Magic 2014 Core Set (Rare)
Emblazoned Golem
Emblazoned Golem 2 (2)
Artifact Creature — Golem (1/2)

Kicker Variable Colorless (You may pay an additional Variable Colorless as you cast this spell.)

Spend only colored mana on X. No more than one mana of each color may be spent this way.

If Emblazoned Golem was kicked, it enters the battlefield with X +1/+1 counters on it.

Apocalypse (Uncommon)
Energy Vortex
Energy Vortex 3BlueBlue (5)
Enchantment

As Energy Vortex enters the battlefield, choose an opponent.

At the beginning of your upkeep, remove all vortex counters from Energy Vortex.

At the beginning of the chosen player's upkeep, Energy Vortex deals 3 damage to that player unless they pay 1 for each vortex counter on Energy Vortex.

Variable Colorless: Put X vortex counters on Energy Vortex. Activate this ability only during your upkeep.

Mirage (Rare)
Entreat the Angels
Entreat the Angels Variable ColorlessVariable ColorlessWhiteWhiteWhite (3)
Sorcery

Create X 4/4 white Angel creature tokens with flying.

Miracle Variable ColorlessWhiteWhite (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Commander 2018 (Mythic Rare)
Other Versions
Avacyn Restored (Mythic Rare)
From the Vault: Angels (Mythic Rare)
Modern Masters 2017 Edition (Mythic Rare)
Entreat the Dead
Entreat the Dead Variable ColorlessVariable ColorlessBlackBlackBlack (3)
Sorcery

Return X target creature cards from your graveyard to the battlefield.

Miracle Variable ColorlessBlackBlack (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Commander 2018 (Rare)
Evershrike
Evershrike 3White or BlackWhite or Black (5)
Creature — Elemental Spirit (2/2)

Flying

Evershrike gets +2/+2 for each Aura attached to it.

Variable ColorlessWhite or BlackWhite or Black: Return Evershrike from your graveyard to the battlefield. You may put an Aura card with converted mana cost X or less from your hand onto the battlefield attached to it. If you don't, exile Evershrike.

Eventide (Rare)
Everythingamajig (Everythingamajig (c))
Everythingamajig (Everythingamajig (c)) 5 (5)
Artifact

1: Flip a coin. If you win the flip, add ColorlessColorless. Activate this ability only any time you could cast an instant.

3, Tap: Target player discards a card. Activate this ability only during your turn.

Variable Colorless: Everythingamajig becomes an X/X Construct artifact creature until end of turn.

Unstable (Rare)
Excise
Excise Variable ColorlessWhite (1)
Instant

Exile target attacking creature unless its controller pays Variable Colorless.

Prophecy (Common)
Fall of the Titans
Fall of the Titans Variable ColorlessVariable ColorlessRed (1)
Instant

Surge Variable ColorlessRed (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)

Fall of the Titans deals X damage to each of up to two targets.

Oath of the Gatewatch (Rare)
Flameblast Dragon
Flameblast Dragon 4RedRed (6)
Creature — Dragon (5/5)

Flying

Whenever Flameblast Dragon attacks, you may pay Variable ColorlessRed. If you do, Flameblast Dragon deals X damage to any target.

Commander 2018 (Rare)
Other Versions
Shards of Alara (Rare)
Archenemy (Rare)
Magic 2012 (Rare)
Flaming Gambit
Flaming Gambit Variable ColorlessRed (1)
Instant

Flaming Gambit deals X damage to target player or planeswalker. That player or that planeswalker's controller may choose a creature they control and have Flaming Gambit deal that damage to it instead.

Flashback Variable ColorlessRedRed (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Torment (Uncommon)
Floodwater Dam
Floodwater Dam 3 (3)
Artifact

Variable ColorlessVariable Colorless1, Tap: Tap X target lands.

Masters Edition IV (Rare)
Other Versions
Alliances (Rare)
From Under the Floorboards
From Under the Floorboards 3BlackBlack (5)
Sorcery

Madness Variable ColorlessBlackBlack (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Create three tapped 2/2 black Zombie creature tokens and you gain 3 life. If From Under the Floorboards's madness cost was paid, instead create X of those tokens and you gain X life.

Shadows over Innistrad (Rare)
Frontline Medic
Frontline Medic 2White (3)
Creature — Human Cleric (3/3)

Battalion — Whenever Frontline Medic and at least two other creatures attack, creatures you control gain indestructible until end of turn.

Sacrifice Frontline Medic: Counter target spell with Variable Colorless in its mana cost unless its controller pays 3.

Gatecrash (Rare)
Fungal Behemoth
Fungal Behemoth 3Green (4)
Creature — Fungus (*/*)

Fungal Behemoth's power and toughness are each equal to the number of +1/+1 counters on creatures you control.

Suspend X—Variable ColorlessGreenGreen. X can't be 0. (Rather than cast this card from your hand, you may pay Variable ColorlessGreenGreen and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Fungal Behemoth while it's exiled, you may put a +1/+1 counter on target creature.

Planar Chaos (Rare)
Gaddock Teeg
Gaddock Teeg GreenWhite (2)
Legendary Creature — Kithkin Advisor (2/2)

Noncreature spells with converted mana cost 4 or greater can't be cast.

Noncreature spells with Variable Colorless in their mana costs can't be cast.

Ultimate Box Toppers (Special)
Other Versions
Lorwyn (Rare)
Ultimate Masters (Rare)
Gang Up
Gang Up Variable ColorlessBlack (1)
Instant

Assist (Another player can pay up to Variable Colorless of this spell's cost. You choose the value of X.)

Destroy target creature with power X or less.

Battlebond (Uncommon)
Geth, Lord of the Vault
Geth, Lord of the Vault 4BlackBlack (6)
Legendary Creature — Zombie (5/5)

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Variable ColorlessBlack: Put target artifact or creature card with converted mana cost X from an opponent's graveyard onto the battlefield under your control tapped. Then that player puts the top X cards of their library into their graveyard.

Scars of Mirrodin (Mythic Rare)
Ghalta, Primal Hunger
Ghalta, Primal Hunger 10GreenGreen (12)
Legendary Creature — Elder Dinosaur (12/12)

This spell costs Variable Colorless less to cast, where X is the total power of creatures you control.

Trample

Game Night (Rare)
Other Versions
Rivals of Ixalan (Rare)
Gigantoplasm
Gigantoplasm 3Blue (4)
Creature — Shapeshifter (0/0)

You may have Gigantoplasm enter the battlefield as a copy of any creature on the battlefield, except it has "Variable Colorless: This creature has base power and toughness X/X."

Commander 2015 (Rare)
Goblin Dynamo
Goblin Dynamo 5RedRed (7)
Creature — Goblin Mutant (4/4)

Tap: Goblin Dynamo deals 1 damage to any target.

Variable ColorlessRed, Tap, Sacrifice Goblin Dynamo: It deals X damage to any target.

Legions (Uncommon)
Gorilla Shaman
Gorilla Shaman Red (1)
Creature — Ape Shaman (1/1)

Variable ColorlessVariable Colorless1: Destroy target noncreature artifact with converted mana cost X.

Masters Edition II (Uncommon)
Other Versions
Alliances (Common)
Greel, Mind Raker
Greel, Mind Raker 3BlackBlack (5)
Legendary Creature — Horror Spellshaper (3/3)

Variable ColorlessBlack, Tap, Discard two cards: Target player discards X cards at random.

Prophecy (Rare)
Hammer Mage
Hammer Mage 1Red (2)
Creature — Human Spellshaper (1/1)

Variable ColorlessRed, Tap, Discard a card: Destroy all artifacts with converted mana cost X or less.

Mercadian Masques (Uncommon)
Hazduhr the Abbot
Hazduhr the Abbot 3WhiteWhite (5)
Legendary Creature — Human Cleric (2/5)

Variable Colorless, Tap: The next X damage that would be dealt this turn to target white creature you control is dealt to Hazduhr the Abbot instead.

Homelands (Rare)
Hearth Kami
Hearth Kami 1Red (2)
Creature — Spirit (2/1)

Variable Colorless, Sacrifice Hearth Kami: Destroy target artifact with converted mana cost X.

Champions of Kamigawa (Common)
Helix Pinnacle
Helix Pinnacle Green (1)
Enchantment

Shroud (This enchantment can't be the target of spells or abilities.)

Variable Colorless: Put X tower counters on Helix Pinnacle.

At the beginning of your upkeep, if there are 100 or more tower counters on Helix Pinnacle, you win the game.

Eventide (Rare)
Helm of Obedience
Helm of Obedience 4 (4)
Artifact

Variable Colorless, Tap: Target opponent puts cards from the top of their library into their graveyard until a creature card or X cards are put into that graveyard this way, whichever comes first. If a creature card is put into that graveyard this way, sacrifice Helm of Obedience and put that card onto the battlefield under your control. X can't be 0.

Masters Edition II (Rare)
Other Versions
Alliances (Rare)
Hero of Leina Tower
Hero of Leina Tower Green (1)
Creature — Human Warrior (1/1)

Heroic — Whenever you cast a spell that targets Hero of Leina Tower, you may pay Variable Colorless. If you do, put X +1/+1 counters on Hero of Leina Tower.

Ultimate Masters (Uncommon)
Other Versions
Born of the Gods (Rare)
Heroes' Podium
Heroes' Podium 5 (5)
Legendary Artifact

Each legendary creature you control gets +1/+1 for each other legendary creature you control.

Variable Colorless, Tap: Look at the top X cards of your library. You may reveal a legendary creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Born of the Gods (Rare)
Hex Parasite
Hex Parasite 1 (1)
Artifact Creature — Insect (1/1)

Variable ColorlessPhyrexian Black: Remove up to X counters from target permanent. For each counter removed this way, Hex Parasite gets +1/+0 until end of turn. (Phyrexian Black can be paid with either Black or 2 life.)

New Phyrexia (Rare)
Hollow Specter
Hollow Specter 1BlackBlack (3)
Creature — Specter (2/2)

Flying

Whenever Hollow Specter deals combat damage to a player, you may pay Variable Colorless. If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.

Legions (Rare)
Hydra Broodmaster
Hydra Broodmaster 4GreenGreen (6)
Creature — Hydra (7/7)

Variable ColorlessVariable ColorlessGreen: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)

When Hydra Broodmaster becomes monstrous, create X X/X green Hydra creature tokens.

Journey into Nyx (Rare)
Ice Cauldron
Ice Cauldron 4 (4)
Artifact

Variable Colorless, Tap: Put a charge counter on Ice Cauldron and exile a nonland card from your hand. You may cast that card for as long as it remains exiled. Note the type and amount of mana spent to pay this activation cost. Activate this ability only if there are no charge counters on Ice Cauldron.

Tap, Remove a charge counter from Ice Cauldron: Add Ice Cauldron's last noted type and amount of mana. Spend this mana only to cast the last card exiled with Ice Cauldron.

Masters Edition IV (Rare)
Other Versions
Ice Age (Rare)
Illusionary Mask
Illusionary Mask 2 (2)
Artifact

Variable Colorless: You may choose a creature card in your hand whose mana cost could be paid by some amount of, or all of, the mana you spent on Variable Colorless. If you do, you may cast that card face down as a 2/2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage, be dealt damage, or become tapped, instead it's turned face up and assigns or deals damage, is dealt damage, or becomes tapped. Activate this ability only any time you could cast a sorcery.

Masters Edition III (Rare)
Other Versions
Limited Edition Alpha (Rare)
Limited Edition Beta (Rare)
Unlimited Edition (Rare)
In the Eye of Chaos
In the Eye of Chaos 2Blue (3)
World Enchantment

Whenever a player casts an instant spell, counter it unless that player pays Variable Colorless, where X is its converted mana cost.

Masters Edition IV (Rare)
Other Versions
Legends (Rare)
Increasing Confusion
Increasing Confusion Variable ColorlessBlue (1)
Sorcery

Target player puts the top X cards of their library into their graveyard. If this spell was cast from a graveyard, that player puts twice that many cards into their graveyard instead.

Flashback Variable ColorlessBlue (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Dark Ascension (Rare)
Invoke Prejudice
Invoke Prejudice BlueBlueBlueBlue (4)
Enchantment

Whenever an opponent casts a creature spell that doesn't share a color with a creature you control, counter that spell unless that player pays Variable Colorless, where X is its converted mana cost.

Legends (Rare)
Isareth the Awakener
Isareth the Awakener 1BlackBlack (3)
Legendary Creature — Human Wizard (3/3)

Deathtouch

Whenever Isareth the Awakener attacks, you may pay Variable Colorless. When you do, return target creature card with converted mana cost X from your graveyard to the battlefield with a corpse counter on it. If that creature would leave the battlefield, exile it instead of putting it anywhere else.

Core Set 2019 (Rare)
Jiwari, the Earth Aflame
Jiwari, the Earth Aflame 3RedRed (5)
Legendary Creature — Spirit (3/3)

Variable ColorlessRed, Tap: Jiwari, the Earth Aflame deals X damage to target creature without flying.

Channel — Variable ColorlessRedRedRed, Discard Jiwari: Jiwari deals X damage to each creature without flying.

Saviors of Kamigawa (Rare)
Kaho, Minamo Historian
Kaho, Minamo Historian 2BlueBlue (4)
Legendary Creature — Human Wizard (2/2)

When Kaho, Minamo Historian enters the battlefield, search your library for up to three instant cards and exile them. Then shuffle your library.

Variable Colorless, Tap: You may cast a card with converted mana cost X exiled with Kaho without paying its mana cost.

Saviors of Kamigawa (Rare)
Kangee, Aerie Keeper
Kangee, Aerie Keeper 2WhiteBlue (4)
Legendary Creature — Bird Wizard (2/2)

Kicker Variable Colorless2 (You may pay an additional Variable Colorless2 as you cast this spell.)

Flying

When Kangee, Aerie Keeper enters the battlefield, if it was kicked, put X feather counters on it.

Other Bird creatures get +1/+1 for each feather counter on Kangee, Aerie Keeper.

Invasion (Rare)
Kentaro, the Smiling Cat
Kentaro, the Smiling Cat 1White (2)
Legendary Creature — Human Samurai (2/1)

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

You may pay Variable Colorless rather than pay the mana cost for Samurai spells you cast, where X is that spell's converted mana cost.

Betrayers of Kamigawa (Rare)
Kessig Wolf Run
Kessig Wolf Run (0)
Land

Tap: Add Colorless.

Variable ColorlessRedGreen, Tap: Target creature gets +X/+0 and gains trample until end of turn.

From the Vault: Twenty (Mythic Rare)
Other Versions
Innistrad (Rare)
Knollspine Invocation
Knollspine Invocation 1RedRed (3)
Enchantment

Variable Colorless, Discard a card with converted mana cost X: Knollspine Invocation deals X damage to any target.

Shadowmoor (Rare)
Latulla, Keldon Overseer
Latulla, Keldon Overseer 3RedRed (5)
Legendary Creature — Human Spellshaper (3/3)

Variable ColorlessRed, Tap, Discard two cards: Latulla, Keldon Overseer deals X damage to any target.

Prophecy (Rare)
Lavaclaw Reaches
Lavaclaw Reaches (0)
Land

Lavaclaw Reaches enters the battlefield tapped.

Tap: Add Black or Red.

1BlackRed: Until end of turn, Lavaclaw Reaches becomes a 2/2 black and red Elemental creature with "Variable Colorless: This creature gets +X/+0 until end of turn." It's still a land.

Ultimate Box Toppers (Special)
Other Versions
Worldwake (Rare)
Ultimate Masters (Rare)
Lazav, the Multifarious
Lazav, the Multifarious BlueBlack (2)
Legendary Creature — Shapeshifter (1/3)

When Lazav, the Multifarious enters the battlefield, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Variable Colorless: Lazav, the Multifarious becomes a copy of target creature card in your graveyard with converted mana cost X, except its name is Lazav, the Multifarious, it's legendary in addition to its other types, and it has this ability.

Guilds of Ravnica (Mythic Rare)
League Guildmage
League Guildmage BlueRed (2)
Creature — Human Wizard (2/2)

3Blue, Tap: Draw a card.

Variable ColorlessRed, Tap: Copy target instant or sorcery spell you control with converted mana cost X. You may choose new targets for the copy.

Guilds of Ravnica (Uncommon)
Lilting Refrain
Lilting Refrain 1Blue (2)
Enchantment

At the beginning of your upkeep, you may put a verse counter on Lilting Refrain.

Sacrifice Lilting Refrain: Counter target spell unless its controller pays Variable Colorless, where X is the number of verse counters on Lilting Refrain.

Urza's Saga (Uncommon)
Lin Sivvi, Defiant Hero
Lin Sivvi, Defiant Hero 1WhiteWhite (3)
Legendary Creature — Human Rebel (1/3)

Variable Colorless, Tap: Search your library for a Rebel permanent card with converted mana cost X or less and put it onto the battlefield. Then shuffle your library.

3: Put target Rebel card from your graveyard on the bottom of your library.

Nemesis (Rare)
Linessa, Zephyr Mage
Linessa, Zephyr Mage 3Blue (4)
Legendary Creature — Human Wizard (3/3)

Variable ColorlessBlueBlue, Tap: Return target creature with converted mana cost X to its owner's hand.

Grandeur — Discard another card named Linessa, Zephyr Mage: Target player returns a creature they control to its owner's hand, then repeats this process for an artifact, an enchantment, and a land.

Future Sight (Rare)