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Biomass Mutation (214)

DSC · Duskmourn: House of Horror Commander · 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.

"A regression to ancient forms? A glimpse of future evolutions? Or a fleeting alteration of the present?" —Vorel of the Hull Clade

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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.

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