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Erratic Mutation
Instant
common
Choose target creature. Reveal cards from the top of your library until you reveal a nonland card. That creature gets +X/-X until end of turn, where X is that card's mana value. Put all cards revealed this way on the bottom of your library in any order.
Card Kingdom
CardmarketSemantic Tags
A keyword that lets a creature card be cast as a mutating creature spell. See rule 702.140, “Mutate.”
A spell or ability that gives a temporary power/toughness boost.
Cares about or manipulates the top card(s) of your library. Includes scry, surveil, and top-deck payoffs.
Cares about or manipulates the top of library — Sensei's Top, miracles, Future Sight.
Format Legality
Price history
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Printings (3)
| Set | Rarity | TCGplayer | Card Kingdom | Cardmarket |
|---|---|---|---|---|
| Time Spiral Remastered#67 | common | · | · | · |
| Modern Masters#42 | common | · | · | · |
| Planar Chaos#41 | common | · | · | · |
Related Rules
Some keyword abilities, such as equip and modular, represent targeted activated or triggered abilities, and some keyword abilities, such as mutate, cause spells to have targets. In those cases, the phrase “target [something]” appears in the rule for that keyword ability rather than in the ability itself. (The keyword’s reminder text will often contain the word “target.”) See rule 702, “Keyword Abilities.”
Mutate
Mutate appears on some creature cards. It represents a static ability that functions while the spell with mutate is on the stack. “Mutate [cost]” means “You may pay [cost] rather than pay this spell’s mana cost. If you do, it becomes a mutating creature spell and targets a non-Human creature with the same owner as this spell.” Casting a spell using its mutate ability follows the rules for paying alternative costs (see 601.2b and 601.2f–h).
One keyword causes an object to merge with a permanent. See rule 702.140, “Mutate.”
Rulings
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
You reveal cards and the creature gets +X/-X all while Erratic Mutation is resolving. Nothing can happen in between, and no player can take actions.