Astral Cornucopia enters the battlefield with X charge counters on it.

{T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.

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

Create X 1/1 green Forest Dryad land creature tokens. (They're affected by summoning sickness.)

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

Create X tapped 2/1 white and black Inkling creature tokens with flying. If X is 6 or more, destroy all noncreature, nonland permanents.

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 or planeswalker and each creature that player or that planeswalker's controller controls.

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

Crackle with Power deals five times X damage to each of up to X targets.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

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

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

When Defenders of Humanity enters the battlefield, create X 2/2 white Astartes Warrior creature tokens with vigilance.

{X}{2}{W}, Exile Defenders of Humanity: Create X 2/2 white Astartes Warrior creature tokens with vigilance. Activate only if you control no creatures and only during your turn.

Search your library for up to X cards, put those cards into your hand, then shuffle.

Return all nonland permanents with mana value X or less to their owners' hands.

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

Destroy X target nonblack creatures. Draw X cards.

Whenever you cast a spell with {X} in its mana cost, put two charge counters on Elementalist's Palette.

{T}: Add one mana of any color.

{T}: Add {C} for each charge counter on Elementalist's Palette. Spend this mana only on costs that contain {X}.

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

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Explosion deals X damage to any target. Target player draws X cards.

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

Create X 2/2 white Soldier creature tokens with vigilance. If X is 10 or more, also create X 4/4 white Angel creature tokens with flying and vigilance.

Destroy all creatures with mana value X or less.

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

Create X 2/2 red Human Knight creature tokens with trample and haste.

Whenever one or more creatures you control deal combat damage to one or more players this turn, you become the monarch.

When Gadwick, the Wizened enters the battlefield, 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.

Create X X/X green Ooze creature tokens.

Create X 1/1 green and white Citizen creature tokens. Creatures you control gain indestructible until end of turn.

Choose one --

• Destroy X target artifacts and/or enchantments.

• Target player gains twice X life.

When you cast this spell, you gain half X life and draw half X cards. Round down each time.

Flying, trample

Hydroid Krasis enters the battlefield with X +1/+1 counters on it.

Search your library for a snow land card, put it onto the battlefield tapped, then shuffle.

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

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

• Breathe Flame -- Klauth's Will deals X damage to each creature without flying.

• Smash Relics -- Destroy up to X target artifacts and/or enchantments.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Trample

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

When Lifeblood Hydra dies, you gain life and draw cards equal to its power.

Spiritual Leader -- At the beginning of combat on your turn, put a +1/+1 counter on target creature.

Psychic Stimulus -- {T}: Add {C}{C}. When you next cast a spell with {X} in its mana cost or activate an ability with {X} in its activation cost this turn, copy that spell or ability. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

If you tap a permanent for mana, it produces twice as much of that mana instead.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Create X 1/1 white Soldier creature tokens with lifelink.

Create X 1/1 white Soldier creature tokens. If X is 5 or more, destroy all other creatures.

Gain control of X target creatures and/or planeswalkers.

Creatures you control get +1/+1.

Whenever you tap a land for mana, add one mana of any type that land produced.

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

Strategic Coordinator -- Basic lands you control have "{T}: Add {C}{C}. Spend this mana only on costs that contain {X}."

Choose one --

• Search your library for up to X land cards, reveal them, put them into your hand, then shuffle.

• Nylea's Intervention deals twice X damage to each creature with flying.

Trample

If you tap a permanent for mana, it produces three times as much of that mana instead.

If you would lose unspent mana, that mana becomes black instead.

At the beginning of your precombat main phase, look at the top card of your library. You may reveal that card if it has three or more colored mana symbols in its mana cost. If you do, add three mana in any combination of its colors and put it into your hand. If you don't reveal it, put it into your hand.

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)

Return X cards at random from your graveyard to your hand. Exile Reap the Past.

Destroy up to X target artifacts. If X is 5 or more, for each artifact destroyed this way, create a token that's a copy of it. Those tokens gain haste. Exile them at the beginning of the next end step.

Destroy X target artifacts. Create X 2/2 red Gremlin creature tokens.

You have no maximum hand size.

{T}: Add {C}.

When Rocco, Cabaretti Caterer enters the battlefield, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

{T}: Add {C}{C}{C}{C}. Spend this mana only on costs that contain {X}.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Defender

Spore Chimney -- When Sporocyst enters the battlefield, search your library for up to X basic land cards, put them onto the battlefield tapped, then shuffle.

Subterranean Tremors deals X damage to each creature without flying. If X is 4 or more, destroy all artifacts. If X is 8 or more, create an 8/8 red Lizard creature token.

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Death Frenzy -- When Termagant Swarm dies, create a number of 1/1 green Tyranid creature tokens equal to Termagant Swarm's power.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Trample

Spawn Termagants -- Whenever Tervigon deals combat damage to a player, create that many 1/1 green Tyranid creature tokens.

When The Meathook Massacre enters the battlefield, each creature gets -X/-X until end of turn.

Whenever a creature you control dies, each opponent loses 1 life.

Whenever a creature an opponent controls dies, you gain 1 life.

Search your library for a Forest card, put it onto the battlefield, then shuffle.

Repeat the following process X times. Each opponent loses 3 life unless that player sacrifices a nonland permanent or discards a card.

Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X.

Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy.

If you tap a basic land for mana, it produces three times as much of that mana instead.

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Return target creature or land card from your graveyard to your hand. (Then exile this card. You may cast the enchantment later from exile.)

Walking Ballista enters the battlefield with X +1/+1 counters on it.

{4}: Put a +1/+1 counter on Walking Ballista.

Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.

Whenever you cast a noncreature spell, draw a card.

You gain X life. Create X 1/1 colorless Phyrexian Mite artifact creature tokens with toxic 1 and "This creature can't block." If X is 5 or more, destroy all other creatures. (Players dealt combat damage by a creature with toxic 1 also get a poison counter.)

Create X 2/2 white Cat creature tokens. Shuffle White Sun's Zenith into its owner's library.

Return X target cards from your graveyard to your hand. Exile Wildest Dreams.

Deathtouch

{T}: Add two mana of any one color.

Whenever you cast a spell with {X} in its mana cost, create a 0/0 green Hydra creature token, then put X +1/+1 counters on it.

Whenever you tap a land for mana, add one mana of any type that land produced. (The types of mana are white, blue, black, red, green, and colorless.)

Whenever you cast a creature spell, draw a card.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Flying, ward {2}

Warp Blast -- When Zoanthrope enters the battlefield, it deals X damage to any target.