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Rock Slide deals X damage divided as you choose among any number of target attacking or blocking creatures without flying.

Rolling Thunder deals X damage divided as you choose among any number of targets.

Savage Twister deals X damage to each creature.

As an additional cost to cast this spell, discard X land cards.

Destroy X target lands.

Look at the top X cards of target opponent's library. Exile one of those cards and put the rest back on top of that player's library in any order.

Prevent all combat damage X target creatures would deal this turn.

Return X target creature cards from your graveyard to your hand. You lose X life.

Defender (This creature can't attack.)

This creature enters with X +1/+1 counters on it.

As an additional cost to cast this spell, exile X cards from your graveyard.

You draw X cards and you lose X life.

Spend only black and/or red mana on X.

Soul Burn deals X damage to any target. You gain life equal to the damage dealt, but not more than the amount of {black}B spent on X, the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.

This enchantment enters with X echo counters on it.

You don't lose the game for having 0 or less life.

At the beginning of your upkeep, sacrifice this enchantment if there are no echo counters on it. Otherwise, target opponent may choose that for each 1 damage that would be dealt to you until your next upkeep, you remove an echo counter from this enchantment instead.

Return two target creature cards from your graveyard to your hand unless any player pays {X}X.

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

X is the number of artifact and/or creature cards in an opponent's graveyard as you cast this spell.

Distribute X +1/+1 counters among any number of target creatures.

Starstorm deals X damage to each creature.

Cycling {3 generic}3 ({3}, Discard this card: Draw a card.)

Target player gains X life.

Target player draws X cards.

Counter target spell unless its controller pays {X}X. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Each player sacrifices X lands of their choice.

Prevent the next X damage that would be dealt to target creature this turn. For each 1 damage prevented this way, put a +1/+1 counter on that creature.

Put a +1/+1 counter on each of X target creatures.

Torrent of Lava deals X damage to each creature without flying.

As long as Torrent of Lava is on the stack, each creature has "{tap}↷: Prevent the next 1 damage that would be dealt to this creature by Torrent of Lava this turn."

Creatures of the creature type of your choice get +X/+X until end of turn.

Tropical Storm deals X damage to each creature with flying and 1 additional damage to each blue creature.

You gain X plus 3 life.

Destroy X target Mountains. Volcanic Eruption deals damage to each creature and each player equal to the number of Mountains put into a graveyard this way.

Volcanic Geyser deals X damage to any target.

X target creatures can't block this turn.

Each player may search their library for up to X creature cards, reveal those cards, put them into their hand, then shuffle.

Tap X target creatures. Winter Blast deals 2 damage to each of those creatures with flying.

Cast this spell only during combat before blockers are declared.

X can't be greater than the number of snow lands you control.

Choose X target attacking creatures. For each of those creatures, its controller may pay {1 generic}1 or {2 generic}2. If that player doesn't, destroy that creature at end of combat. If that player pays only {1 generic}1, prevent all combat damage that would be dealt to and dealt by that creature this combat.

Tap X target creatures.