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Creatures you control have base power and toughness X/X until end of turn.
Abilities, attacks, weakness & resistance
Other cards from Commander 2019
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Biomass Mutation (C19-187) is a rare instant from Commander 2019 with a hybrid green/blue cost including X. It sets the base power and toughness of all creatures you control to X/X until end of turn, overwriting effects that set power/toughness to specific values while still interacting with modifiers like counters and auras. As an instant, it can be used offensively to create large temporary attackers or defensively to reset creatures and trigger state-based effects.
Catalog pricing data as of 18 Apr 2026, 00:13
