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Creatures you control have base power and toughness X/X until end of turn.
Abilities, attacks, weakness & resistance
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Biomass Mutation (PIP-475) is a Rare Instant. It sets the base power and toughness of creatures you control to X/X until end of turn, overwriting effects that set specific values while still interacting with counters and modifiers per its rulings. As a board-sizing tool it can massively boost your creatures or, if X is chosen as 0, turn them into 0/0s and potentially clear the board.
Catalog pricing data as of 13 Apr 2026, 04:22
