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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 is a rare Instant. When cast it sets the base power and toughness of all creatures you control to X/X until end of turn, with effects that set P/T being overwritten while modifiers like auras, counters, and power/toughness switches still apply. Because X is chosen on casting it can serve as a massive mass-pump finisher or, if X is zero, force creatures to become 0/0 and die, offering flexible board manipulation in green/blue decks.
Catalog pricing data as of 13 Apr 2026, 04:40
