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Rulings
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.
If a card in a player’s library has in its mana cost, X is considered to be 0.
If a card in a player’s library has in its mana cost, X is considered to be 0.
Rulings
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.
If a card in a player’s library has in its mana cost, X is considered to be 0.
If a card in a player’s library has in its mana cost, X is considered to be 0.
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