First printed in Gatecrash (2013)
All 10 prints
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Secrets of Strixhaven Commander (SOC) #297, 2026
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Duskmourn: House of Horror Commander (DSC) #214, 2024
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Fallout (PIP) #1003, 2024
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Fallout (PIP) #212, 2024
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Fallout (PIP) #475, 2024
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Fallout (PIP) #740, 2024
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The List (PLST) #GTC-213, 2021
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Commander 2021 (C21) #209, 2021
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Commander 2019 (C19) #187, 2019
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Gatecrash (GTC) #213, 2013
Biomass Mutation 
Instant
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
- Illustrated by
- Dan Murayama Scott
- Watermark
- Simic
Legality
- Legal in
- Pioneer, Modern, Legacy, Vintage, Penny Dreadful, Commander, Duel Commander, Tiny Leaders, Oathbreaker
- Not legal in
- Standard, Pauper, Future Standard, Historic, Timeless, Alchemy, Premodern, Old School 93/94, Gladiator, Pauper Commander, PreDH, Brawl, Standard Brawl, Competitive Brawl
Rulings (2)
- 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).
- Choosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.
Prices
MTGO price: 0.006 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).
