Erratic Mutation #42
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Card Details
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.
Illustrated by Zoltan Boros & Gabor Szikszai
Rulings (2)
Mar 19, 2021
If a card in a player's library has 
in its mana cost, X is considered to be 0.
Mar 19, 2021
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.
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