Erratic Mutation is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
01
Official card text
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.
How it works : Erratic Mutation
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If a card in a player's library has
in its mana cost, X is considered to be 0.
No other card is named in this ruling.
- #2· Wizards of the Coast
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.
No other card is named in this ruling.
02
Legal formats
modernlegacypaupervintagepennycommanderoathbreakerpaupercommanderduelpredhtlr
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Meta decks with Erratic Mutation
No archived Top 8 deck with this card yet.




