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Biomass Mutation
Instant
rare
Creatures you control have base power and toughness X/X until end of turn.
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Printings (10)
| Set | Rarity | TCGplayer | Card Kingdom | Cardmarket |
|---|---|---|---|---|
| Secrets of Strixhaven Commander#297 | rare | · | · | · |
| Duskmourn: House of Horror Commander#214 | rare | · | · | · |
| Fallout#212 | rare | · | · | · |
| Fallout#1003 | rare | · | · | · |
| Fallout#740 | rare | · | · | · |
| Fallout#475 | rare | · | · | · |
| The List#GTC-213 | rare | · | · | · |
| Commander 2021#209 | rare | · | · | · |
| Commander 2019#187 | rare | · | · | · |
| Gatecrash#213 | rare | · | · | · |
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.