Biomass Mutation
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Magic: The Gathering
Mana cost
Commander 2021C21 · #209
- Card type
- Instant
- Rarity
- Rare
- Indicative price
- 0.20 € · 0.21 $
- Mana value
- 2
- Colour
- Blue Green
Card text
Creatures you control have base power and toughness X/X until end of turn.
Format legality
- CommanderLegal
- DuelLegal
- LegacyLegal
- ModernLegal
- OathbreakerLegal
- PennyLegal
- PioneerLegal
- VintageLegal
Legalities follow the imported catalogue; check format rules before a tournament.
Data imported on 2026-10-06 (UTC).
Indicative Scryfall prices, updated daily. ★: foil; ★ E: etched foil. EUR and USD represent different markets.
Printing information
- Illustrator
- Dan Murayama Scott
- Card language
- English
- Release date
- 2021-04-23
Flavour text
"A regression to ancient forms? A glimpse of future evolutions? Or a fleeting alteration of the present?" —Vorel of the Hull Clade
Rulings
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.
