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Biomass Mutation
SOC · Secrets of Strixhaven Commander #297 · Rare · released 2026-04-24
{X}{G/U}{G/U}
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
Biomass Mutation is a rare green-blue instant from Secrets of Strixhaven Commander (2026). It has been printed 10 times across 7 sets, from 2013 to 2026. Recent market prices range from $0.21 to $1.44 depending on printing and finish. It is legal in Pioneer, Modern, Legacy, Vintage, Commander, Oathbreaker and Penny Dreadful.
USD$0.20
Format legality
Where you can play Biomass Mutation in sanctioned and popular formats.
StandardNot legal
PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
CommanderLegal
PauperNot legal
OathbreakerLegal
HistoricNot legal
BrawlNot legal
Penny DreadfulLegal
All printings (10)
Prices range from $0.21 to $1.44 across finishes. Cheapest printing: Commander 2021 at $0.21.
| Set | No. | Rarity | Price | Foil |
|---|---|---|---|---|
| Gatecrash | 213 | Rare | $0.23 | $0.65 |
| Commander 2019 | 187 | Rare | $0.23 | — |
| Commander 2021 | 209 | Rare | $0.21 | — |
| The List | GTC-213 | Rare | $0.39 | — |
| Fallout | 1003 | Rare | — | $1.44 |
| Fallout | 740 | Rare | — | $0.87 |
| Fallout | 475 | Rare | $0.36 | $0.41 |
| Fallout | 212 | Rare | $0.22 | $0.65 |
| Duskmourn: House of Horror Commander | 214 | Rare | $0.25 | — |
| Secrets of Strixhaven Commander This page | 297 | Rare | $0.22 | — |
More from Secrets of Strixhaven Commander
Rulings
Official rulings from Wizards of the Coast (2).
- 2013-01-24Choosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.
- 2013-01-24Biomass 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).
Frequently asked questions
Is Biomass Mutation legal in Commander?
Yes — Biomass Mutation is legal in Commander (EDH).
What formats is Biomass Mutation legal in?
Biomass Mutation is legal in Pioneer, Modern, Legacy, Vintage, Commander, Oathbreaker and Penny Dreadful.
How many times has Biomass Mutation been printed?
Biomass Mutation has been printed 10 times across 7 sets, from 2013 to 2026.
What is the cheapest printing of Biomass Mutation?
The cheapest printing is Commander 2021 (#209) at about $0.21.
Who illustrated Biomass Mutation?
This printing of Biomass Mutation was illustrated by Dan Murayama Scott.