Erratic Mutation

two generic mana one blue mana Instant

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.

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Showing Planar Chaos#41

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Erratic Mutation rulings

2021-03-19
If a card in a player's library has in its mana cost, X is considered to be 0.
2021-03-19
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.