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Biomass Mutation (740)

PIP · Fallout · rare

Mana cost
Mana value	2.0
Type	Instant
Rarity	rare
Colors	G, U
EDHREC rank	4880

Creatures you control have base power and toughness X/X until end of turn.

Vault 87's Evolutionary Experimentation Program exposed subjects to an airborne version of FEV. Rapid physical enhancements accompanied sharp mental regression, and the oldest mutants would become almost feral.

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Printings

Gatecrash $0.23 Commander 2019 $0.24 The List $0.39 Commander 2021 $0.19 Fallout — Fallout $0.22 Fallout $0.35 Fallout — Duskmourn: House of Horror Commander $0.22 Secrets of Strixhaven Commander $0.19

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Legality

Rulings

• 2013-01-24: Biomass 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).
• 2013-01-24: Choosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.