Activated abilities of creatures you control cost less to activate, where X is Agatha of the Vile Cauldron's power. This effect can't reduce the mana in that cost to less than one mana.

: Other creatures you control get +1/+1 and gain trample and haste until end of turn.

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

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

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

, : Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay , where X is that mana value. 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 only before attackers are declared.

Flying, lifelink, ward

Disguise

When Aurelia's Vindicator is turned face up, exile up to X other target creatures from the battlefield and/or creature cards from graveyards.

When Aurelia's Vindicator leaves the battlefield, return the exiled cards to their owners' hands.

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 . If you do, you gain X life and draw X cards.

Morph (You may cast this card face down as a 2/2 creature for . 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.

Barad-dûr enters the battlefield tapped unless you control a legendary creature.

: Add .

, : Amass Orcs X. Activate only if a creature died this turn.

Wurms you control get +2/+2 and have trample.

, : Create a 4/4 green Wurm creature token. This ability costs less to activate, where X is the greatest power among Wurms you control.

Equipped creature has base power and toughness 10/10.

Equip . This ability costs less to activate, where X is the power of the creature it targets.

Blast Zone enters the battlefield with a charge counter on it.

: Add .

, : Put X charge counters on Blast Zone.

, , Sacrifice Blast Zone: Destroy each nonland permanent with mana value equal to the number of charge counters on Blast Zone.

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

Counter target spell unless its controller pays . Clash with an opponent. If you win, that spell's controller mills four cards. (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 mana value.)

Counter target spell unless its controller pays , where X is the number of words in the name with the most words among permanents you control.

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

, : Untap X target lands.

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

When Champions of Minas Tirith enters the battlefield, you become the monarch.

At the beginning of combat on each opponent's turn, if you're the monarch, that opponent may pay , where X is the number of cards in their hand. If they don't, they can't attack you this combat.

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

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.

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

, : Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle.

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.

, : 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 only during your upkeep.

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.

, : 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 only during your upkeep.

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

Counter target spell unless its controller pays . 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.)

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

This spell costs less to cast, where X is your devotion to white. (Each in the mana costs of permanents you control counts toward your devotion to white.)

Flying

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

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

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

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

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

Equip

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

Suspend X—. X can't be 0. (Rather than cast this card from your hand, you may pay and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may 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.

: 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.

Flying

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

This spell costs less to cast, where X is the total mana value of Dragons you control.

Flying, trample

, Sacrifice a land: Return Earthquake Dragon from your graveyard to your hand.

Flying, ward

Whenever Elenda and Azor attacks, you may pay . If you do, draw X cards.

At the beginning of each end step, you may pay 4 life. If you do, create a number of 1/1 black Vampire Knight creature tokens with lifelink equal to the number of cards you've drawn this turn.

Whenever you scry, the next instant or sorcery spell you cast this turn costs less to cast, where X is the number of cards looked at while scrying this way.

+2: Draw a card, then scry 2.

−3: Exile the top card of your library. Create a number of 1/1 blue Faerie Dragon creature tokens with flying equal to that card's mana value.

Elminster can be your commander.

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 for each vortex counter on Energy Vortex.

: Put X vortex counters on Energy Vortex. Activate only during your upkeep.

You may choose not to untap Entrancing Lyre during your untap step.

, : Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as Entrancing Lyre remains tapped.

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

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

Flying

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

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

Exile target attacking creature unless its controller pays .

Surge (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.

Flying

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

, : Tap X target lands.

Madness (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 this spell's madness cost was paid, instead create X of those tokens and you gain X life.

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

Suspend X—. X can't be 0. (Rather than cast this card from your hand, you may pay and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may 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.

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

Destroy target creature with power X or less.

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

: Put target artifact or creature card with mana value X from an opponent's graveyard onto the battlefield under your control tapped. Then that player mills X cards.

Flying

: Another target creature gains flying until end of turn.

Channel — , Discard Ghost-Lit Drifter: X target creatures gain flying until end of turn.

: Goblin Dynamo deals 1 damage to any target.

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