Magecraft -- Whenever you cast or copy an instant or sorcery spell, draw a card.

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

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

As an additional cost to cast this spell, discard a card.

Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.")

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

({T}: Add {G} or {U}.)

As Breeding Pool enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

Gain control of target spell that targets only a single permanent or player. Copy it, then reselect the targets at random for the spell and the copy. The new targets can't be you or a permanent you control.

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.)

Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

({T}: Add {R} or {G}.)

Cinder Glade enters the battlefield tapped unless you control two or more basic lands.

{T}: Add one mana of any color in your commander's color identity.

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

Magecraft -- Whenever you cast or copy an instant or sorcery spell, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is that spell's mana value.

{3}{U}: Target creature token can't be blocked this turn.

As an additional cost to cast this spell, sacrifice an artifact or discard a card.

Draw two cards.

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

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}.

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.

Draw two cards. You may put a land card from your hand onto the battlefield.

{T}: Add one mana of any color that a land an opponent controls could produce.

When Extraordinary Journey enters the battlefield, exile up to X target creatures. For each of those cards, its owner may play it for as long as it remains exiled.

Whenever one or more nontoken creatures enter the battlefield, if one or more of them entered from exile or was cast from exile, you draw a card. This ability triggers only once each turn.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Flash

Flying

During each opponent's end step, you may cast spells as though they had flash.

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

Enchant creature

{U}: Tap enchanted creature.

{U}: Untap enchanted creature.

As Frostboil Snarl enters the battlefield, you may reveal an Island or Mountain card from your hand. If you don't, Frostboil Snarl enters the battlefield tapped.

{T}: Add {U} or {R}.

As Game Trail enters the battlefield, you may reveal a Mountain or Forest card from your hand. If you don't, Game Trail enters the battlefield tapped.

{T}: Add {R} or {G}.

For each player, choose target nonenchantment, nonland permanent that player controls. Those permanents' owners shuffle them into their libraries. Each player who controlled one of those permanents exiles cards from the top of their library until they exile a nonland card, then puts the rest on the bottom of their library in a random order. Each player may cast the nonland card they exiled without paying its mana cost.

Hell to Pay deals X damage to target creature. Create a number of tapped Treasure tokens equal to the amount of excess damage dealt to that creature this way.

({T}: Add {R} or {G}.)

Highland Forest enters the battlefield tapped.

Hinterland Harbor enters the battlefield tapped unless you control a Forest or an Island.

{T}: Add {G} or {U}.

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.

Iceberg enters the battlefield with X ice counters on it.

{3}: Put an ice counter on Iceberg.

Remove an ice counter from Iceberg: Add {C}.

Enchant creature

Enchanted creature can attack as though it had haste.

{0}: Untap enchanted creature. Activate only during your turn and only once each turn.

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}.)

Draw a card for each attacking creature.

{T}: Add {C}.

{X}{R}{G}, {T}: Target creature gets +X/+0 and gains trample until end of turn.

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.

Flash

When Lost in the Maze enters the battlefield, tap X target creatures. Put a stun counter on each of those creatures you don't control. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Tapped creatures you control have hexproof.

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.)

Reveal the top ten cards of your library. Starting with the next opponent in turn order, each opponent chooses a different nonland card from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.

As an additional cost to cast this spell, you may exile any number of blue cards from your hand. This spell costs {2} less to cast for each card exiled this way.

Up to X target creatures phase out. (While they're phased out, they're treated as though they don't exist. Each one phases in before its controller untaps during their next untap step.)

Surveil 2, then choose an instant or sorcery card in your graveyard. You may cast it this turn. If that spell would be put into your graveyard, exile it instead. (To surveil 2, look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

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

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

{X}{U}{R}, {T}: Nin, the Pain Artist deals X damage to target creature. That creature's controller draws X cards.

Trample

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

X can't be greater than the number of players in the game.

Reveal cards from the top of your library until you reveal X land cards. Put those land cards onto the battlefield tapped and the rest on the bottom of your library in a random order.

Destroy up to X target artifacts and/or enchantments. Create twice X 1/1 black and green Pest creature tokens with "When this creature dies, you gain 1 life."

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

Put X +1/+1 counters on target creature you control. Then counter up to one target spell unless its controller pays mana equal to the greatest power among creatures you control.

Spree (Choose one or more additional costs.)

+ {1} -- Copy target instant spell, sorcery spell, activated ability, or triggered ability. You may choose new targets for the copy.

+ {1} -- Change the target of target spell or ability with a single target.

({T}: Add {G} or {U}.)

Rimewood Falls enters the battlefield tapped.

Rootbound Crag enters the battlefield tapped unless you control a Mountain or a Forest.

{T}: Add {R} or {G}.

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flying, haste

Shivan Devastator enters the battlefield with X +1/+1 counters on it.

{T}: Add {C}.

{T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

Look at the top six cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Silundi Isle enters the battlefield tapped.

{T}: Add {U}.

You may cast Silver Scrutiny as though it had flash if X is 3 or less.

Draw X cards.

({T}: Add {U}.)

{T}: Add {C}{C}.

Create X 1/1 black Rat creature tokens with "This creature can't block." Creatures you control gain haste until end of turn.

Spirebluff Canal enters the battlefield tapped unless you control two or fewer other lands.

{T}: Add {U} or {R}.

Will of the council -- Choose target instant or sorcery spell. Starting with you, each player votes for denial or duplication. If denial gets more votes, counter the spell. If duplication gets more votes or the vote is tied, copy the spell. You may choose new targets for the copy.

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.

({T}: Add {R} or {G}.)

As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

When you cast your next instant or sorcery spell this turn, copy that spell X times. You may choose new targets for the copies.

Storm-Kiln Artist gets +1/+0 for each artifact you control.

Magecraft -- Whenever you cast or copy an instant or sorcery spell, create a Treasure token.

As an additional cost to cast this spell, discard a card.

Draw two cards.

{T}: Add {C}.

{X}{X}, {T}, Sacrifice Treasure Vault: Create X Treasure tokens.

If you would copy a spell one or more times, instead copy it that many times plus an additional time. You may choose new targets for the additional copy.

{7}, {T}: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

Equipped creature has "{3}, {Q}: This creature gets +2/+2 until end of turn." ({Q} is the untap symbol.)

Equip {0}

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.

As an additional cost to cast this spell, discard a card.

Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.")

Return target spell or creature to its owner's hand.

As Vineglimmer Snarl enters the battlefield, you may reveal a Forest or Island card from your hand. If you don't, Vineglimmer Snarl enters the battlefield tapped.

{T}: Add {G} or {U}.

{T}: Untap another target permanent.

Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)

When you cycle Vizier of Tumbling Sands, untap target permanent.

({T}: Add {U} or {R}.)

Volatile Fjord enters the battlefield tapped.

Destroy target permanent an opponent controls. Its controller reveals cards from the top of their library until they reveal a permanent card that shares a card type with that permanent. They put that card onto the battlefield and the rest on the bottom of their library in a random order.

You may choose new targets for target instant or sorcery spell. Then copy that spell. You may choose new targets for the copy.

Choose target spell or ability with one or more targets. Roll a d20 and add the greatest power among creatures you control.

1--14 | You may choose new targets for that spell or ability.

15+ | You may choose new targets for that spell or ability. Then copy it. You may choose new targets for the copy.

{T}: Add {C}.

{T}: Add {G} or {U}. Yavimaya Coast deals 1 damage to you.

Magecraft -- Whenever you cast or copy an instant or sorcery spell, scry 1. If that spell's mana value is 5 or greater, create a 4/4 blue and red Elemental creature token. If that spell's mana value is 10 or greater, Zaffai, Thunder Conductor deals 10 damage to an opponent chosen at random.

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.