As an additional cost to cast Aether Tide, discard X creature cards.

Return X target creatures to their owners' hands.

Altered Ego can't be countered.

You may have Altered Ego enter the battlefield as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it.

Apocalypse Hydra enters the battlefield with X +1/+1 counters on it. If X is 5 or more, it enters the battlefield with an additional X +1/+1 counters on it.

, Remove a +1/+1 counter from Apocalypse Hydra: Apocalypse Hydra deals 1 damage to target creature or player.

Aurelia's Fury deals X damage divided as you choose among any number of target creatures and/or players. Tap each creature dealt damage this way. Players dealt damage this way can't cast noncreature spells this turn.

Balduvian Hydra enters the battlefield with X +1/+0 counters on it.

Remove a +1/+0 counter from Balduvian Hydra: Prevent the next 1 damage that would be dealt to Balduvian Hydra this turn.

: Put a +1/+0 counter on Balduvian Hydra. Activate this ability only during your upkeep.

Banefire deals X damage to target creature or player.

If X is 5 or more, Banefire can't be countered by spells or abilities and the damage can't be prevented.

Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.

You may exile a red card with converted mana cost X from your hand rather than pay Blazing Shoal's mana cost.

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

Target player draws X cards. Shuffle Blue Sun's Zenith into its owner's library.

Bonfire of the Damned deals X damage to target player and each creature he or she controls.

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

Target player draws X cards.

Briber's Purse enters the battlefield with X gem counters on it.

, , Remove a gem counter from Briber's Purse: Target creature can't attack or block this turn.

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

Burn from Within deals X damage to target creature or player. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.

Chalice of the Void enters the battlefield with X charge counters on it.

Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void, counter that spell.

Cast Choking Vines only during the declare blockers step.

X target attacking creatures become blocked. Choking Vines deals 1 damage to each of those creatures. (This spell works on creatures that can't be blocked.)

Choose one or more —

• Clan Defiance deals X damage to target creature with flying.

• Clan Defiance deals X damage to target creature without flying.

• Clan Defiance deals X damage to target player.

Multikicker (You may pay an additional any number of times as you cast this spell.)

Choose target creature or player, then choose another target creature or player for each time Comet Storm was kicked. Comet Storm deals X damage to each of them.

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.)

Spend only black mana on X.

Consume Spirit deals X damage to target creature or player and you gain X life.

Crater's Claws deals X damage to target creature or player.

Ferocious — Crater's Claws deals X plus 2 damage to that creature or player instead if you control a creature with power 4 or greater.

Exile X target creatures. For each creature exiled this way, its controller creates a 2/2 green Boar creature token.

Target player creates X 2/2 black Zombie creature tokens, then up to one target creature gets -1/-1 until end of turn for each Zombie that player controls.

Each player loses X life, discards X cards, sacrifices X creatures, then sacrifices X lands.

Death Grasp deals X damage to target creature or player. You gain X life.

Each opponent loses two times X life. You gain life equal to the life lost this way.

Search your library for a multicolored card, reveal it, and put it into your hand. Then shuffle your library.

Destroy target artifact with converted mana cost X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Search your library for up to X cards and put those cards into your hand. Then shuffle your library.

Disintegrate deals X damage to target creature or player. That creature can't be regenerated this turn. If the creature would die this turn, exile it instead.

You may exile a blue card with converted mana cost X from your hand rather than pay Disrupting Shoal's mana cost.

Counter target spell if its converted mana cost 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 target creature or player.

Spend only black mana on X.

Drain Life deals X damage to target creature or player. You gain life equal to the damage dealt, but not more life than the player's life total before Drain Life dealt damage or the creature's toughness.

Destroy X target nonblack creatures. Draw X cards.

Earthquake deals X damage to each creature without flying and each player.

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

Choose one —

• Energy Bolt deals X damage to target player.

• Target player gains X life.

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

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

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.

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 target creatures and/or players.

Choose one —

• Each player draws X cards.

• Each player puts the top X cards of his or her library into his or her graveyard.

Feral Hydra enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Feral Hydra. Any player may activate this ability.

Fireball deals X damage divided evenly, rounded down, among any number of target creatures and/or players.

Fireball costs more to cast for each target beyond the first.

Flaming Gambit deals X damage to target player. That player may choose a creature he or she controls and have Flaming Gambit deal that damage to it instead.

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

Flip X coins; an opponent calls heads or tails. For each flip you win, put a Rabid Sheep token into play. Treat these tokens as 2/2 green creatures that count as Sheep.

Destroy all creatures with converted mana cost X or less.

Destroy each nonland permanent with converted mana cost X or less.

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

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