Exile X target creatures, then investigate X times. Return the exiled cards to the battlefield tapped under their owners' control at the beginning of the next end step. (To investigate, create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost.

Counter target spell if its mana value is X.

Prevent the next X damage that would be dealt to you and/or permanents you control this turn. If damage is prevented this way, Divine Deflection deals that much damage to any target.

Gain control of target creature with mana value X or less.

For each of X target permanents, create X tokens that are copies of that permanent.

Each player mills X cards. For each creature card put into a graveyard this way, you create a tapped 2/2 black Zombie creature token. (To mill a card, a player puts the top card of their library into their graveyard.)

Choose one. If you control a commander as you cast this spell, you may choose both instead.

• Target player draws X cards.

• Target player mills twice X cards.

Aftermath (Cast this spell only from your graveyard. Then exile it.)

Earth deals X damage to each creature without flying.

Search your library and graveyard for up to four creature cards with different names that each have mana value X or less and reveal them. An opponent chooses two of those cards. Shuffle the chosen cards into your library and put the rest onto the battlefield. Exile Ecological Appreciation.

Electrodominance deals X damage to any target. You may cast a spell with mana value X or less from your hand without paying its mana cost.

Sacrifice X Zombies, then reveal cards from the top of your library until you reveal a number of Zombie creature cards equal to the number of Zombies sacrificed this way. Put those cards onto the battlefield and the rest on the bottom of your library in a random order.

Endless One enters with X +1/+1 counters on it.

Choose one —

• Energy Bolt deals X damage to target player or planeswalker.

• Target player gains X life.

Target creature gets +X/+0 until end of turn.

Gain control of target creature with mana value X.

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.)

Reveal the top X plus one cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard.

X can't be 0.

Target spell's controller exiles it with X delay counters on it.

At the beginning of each of that player's upkeeps, if that card is exiled, remove a delay counter from it. If the card has no delay counters on it, the player puts it onto the stack as a copy of the original spell.

Exile target attacking creature unless its controller pays .

Copy target instant or sorcery spell with mana value 4 or less. You may choose new targets for the copy.

Until end of turn, double target creature's power X times.

Target opponent chooses X cards from their hand. Look at those cards. You may cast a spell from among them without paying its mana cost.

Target creature gets -X/-X until end of turn. That creature gets an additional -3/-3 until end of turn if you controlled a Faerie as you cast this spell.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)

Fanning the Flames deals X damage to any target.

Choose one —

• Each player draws X cards.

• Each player mills X cards.

Damage can't be prevented this turn. Fear, Fire, Foes deals X damage to target creature and 1 damage to each other creature with the same controller.

Prevent the next X damage that would be dealt to you this turn.

Draw a card.

Destroy up to three target creatures with toughness X or less. If X is 10 or more, return all creature cards from your graveyard to the battlefield.

You may cast up to one target instant card and/or up to one target sorcery card from your graveyard each with mana value X or less without paying their mana costs. If a spell cast this way would be put into your graveyard, exile it instead. If X is 10 or more, copy each of those spells twice. You may choose new targets for the copies.

This spell costs more to cast for each target beyond the first.

Fireball deals X damage divided evenly, rounded down, among any number of targets.

Flame Discharge deals X damage to target creature or planeswalker. If you controlled a modified creature as you cast this spell, it deals X plus 2 damage instead. (Equipment, Auras you control, and counters are modifications.)

Look at the top X cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Flashback—, Exile X blue cards from your graveyard. (You may cast this card from your graveyard for its flashback cost, then exile it. You can't exile Flash of Insight to pay for its own flashback cost.)

All creatures get +X/-X until end of turn.

Create X tokens that are copies of target token you control. Then tokens you control gain indestructible until your next turn. You gain 1 life for each token you control.

Create X 1/1 red Mercenary creature tokens with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

When Fractal Harness enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach Fractal Harness to it.

Whenever equipped creature attacks, double the number of +1/+1 counters on it.

Equip

As Frankenstein's Monster enters, exile X creature cards from your graveyard. If you can't, put Frankenstein's Monster into its owner's graveyard instead of onto the battlefield. For each creature card exiled this way, Frankenstein's Monster enters with a +2/+0, +1/+1, or +0/+2 counter on it.

When Gadwick, the Wizened enters, draw X cards.

Whenever you cast a blue spell, tap target nonland permanent an opponent controls.

Destroy each nonland permanent with mana value X or less.

When you cast this spell, reveal the top X cards of your library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield. Then shuffle the rest into your library.

Genesis Hydra enters with X +1/+1 counters on it.

Ghired's Belligerence deals X damage divided as you choose among any number of target creatures. Whenever a creature dealt damage this way dies this turn, populate. (Create a token that's a copy of a creature token you control.)

Tap X target creatures. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Goblin Negotiation deals X damage to target creature. Create a number of 1/1 red Goblin creature tokens equal to the amount of excess damage dealt to that creature this way.

Vigilance, trample, haste

Goldvein Hydra enters with X +1/+1 counters on it.

When Goldvein Hydra dies, create a number of tapped Treasure tokens equal to its power.

Reveal the top X plus one cards of your library. Choose a creature card and/or a land card from among them. Put those cards into your hand and the rest on the bottom of your library in a random order. If X is 5 or more, instead put the chosen cards onto the battlefield or into your hand and the rest on the bottom of your library in a random order.

Grenzo, Dungeon Warden enters with X +1/+1 counters on it.

: Put the bottom card of your library into your graveyard. If it's a creature card with power less than or equal to Grenzo's power, put it onto the battlefield.

Distribute X +1/+1 counters among any number of target creatures you control. (Then exile this card. You may cast the creature later from exile.)

Gyrus, Waker of Corpses enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.

Whenever Gyrus attacks, you may exile target creature card with lesser power from your graveyard. If you do, create a token that's a copy of that card and that's tapped and attacking. Exile the token at end of combat.

Haldir, Lórien Lieutenant enters with X +1/+1 counters on it.

Vigilance

: Until end of turn, other Elves you control gain vigilance and get +1/+1 for each +1/+1 counter on Haldir.

Heat Ray deals X damage to target creature.