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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 2021
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Biomass Mutation (C21-209) is a rare instant from Commander 2021 that sets creatures you control to have base power and toughness X/X until end of turn. Casting it with a chosen X overwrites effects that set P/T while still interacting with modifiers like +/− effects, counters, and power/toughness switches. It can massively alter combat outcomes or be a board reset risk if X is set to 0, which will make creatures 0/0 and likely put them into the graveyard.
Catalog pricing data as of 19 Apr 2026, 07:00
