Biomass Mutation
Instant
Set
Rarity
Rare
Mana Cost
Price · Cardmarket trend
€0.18 Foil €0.30 Cheapest printing: soc €0.15
Artist
Nicholas Gregory
Cardmarket trend via Scryfall, as of 10/28/2026. May differ from the actual price.
Oracle Text
Creatures you control have base power and toughness X/X until end of turn.Community
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Wizards of the CoastBiomass Mutation overwrites any effects that set the power and/or toughness of a creature you control to a specific value. Effects that modify power and/or toughness but don't set them to a specific value (like the one created by Giant Growth), power/toughness changes from counters, and effects that switch a creature's power and toughness will continue to apply. For example, say you control a 1/1 creature that's getting +4/+2 from an Aura, has a +1/+1 counter on it, and is affected by an effect that switches its power and toughness. This creature is 4/6. If you cast Biomass Mutation with X equal to 4, the creature would become 7/9 (4/4, +4/+2 from the Aura, +1/+1 from the counter, then switch power and toughness).
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Wizards of the CoastChoosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.
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