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Counter target spell. At the beginning of your next precombat main phase, add X mana in any combination of colors, where X is that spell's mana value.

Flying, lifelink Whenever you cast a spell from anywhere other than your hand, you may cast a permanent spell with equal or lesser mana value from ...

This spell can't be countered. Flying Whenever you draw a card, Niv-Mizzet, Parun deals 1 damage to any target. Whenever a player casts an instant ...

As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one o...

Flying, lifelink Whenever you cast a spell from anywhere other than your hand, you may cast a permanent spell with equal or lesser mana value from ...

When Hostage Taker enters the battlefield, exile another target creature or artifact until Hostage Taker leaves the battlefield. You may cast that ...

Lifelink Whenever an Aura you control becomes attached to a nonland permanent an opponent controls with mana value less than or equal to that Aura'...

Improvise (Your artifact can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) You may have Sy...

Instant and sorcery spells you cast cost {1} less to cast.

Vigilance When this creature enters, target player gets two rad counters. Whenever one or more nonland cards are milled, draw a card, then put a +1...

When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy. Flashback {1}{U}{R} (You may ...

Ninjutsu {2}{U}{B} ({2}{U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attac...

Storm (When you cast this spell, copy it for each spell cast before it this turn.) Proliferate. (Choose any number of permanents and/or players, th...

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.

Look at the top three cards of your library. Put one of them into your hand, put one of them on the bottom of your library, and exile one of them. ...

Exile the top X cards of your library. You may cast instant and sorcery spells with mana value X or less from among them without paying their mana ...

Whenever a creature deals combat damage to one of your opponents, its controller may draw a card.

Whenever you cast a spell during your turn other than your first spell that turn, create a 2/2 blue and black Zombie Rogue creature token. Whenever...

Whenever you cast a spell during your turn other than your first spell that turn, create a 2/2 blue and black Zombie Rogue creature token. Whenever...

Flying, deathtouch When Baleful Strix enters the battlefield, draw a card.

Whenever a Zombie or Mutant you control dies, if its power was different from its base power, draw a card. Come Fly With Me — {2}, Sacrifice a crea...

Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Scry 2, then draw two cards. You get {E}{E} (two energy counters).

Enchant player At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anyw...