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Biomass MutationClick or tap the image to zoom Biomass Mutation
Instant Creatures you control have base power and toughness X/X until end of turn. Artist: Dan Murayama Scott Color identity: G, U Reference prices
Data snapshot 2026-10-22. Not live offers. Use in a combo · Use in a deck Editions & versions10 printings across 7 editions. Choose a printing to view its artwork and details. Reference prices · Data snapshot 2026-10-22. Prices vary by seller and condition; — means no quote.  Secrets of Strixhaven Commander
MTGO: 0.05 tix View this printing Duskmourn: House of Horror Commander
MTGO: 0.03 tix View this printing Fallout
MTGO: 0.02 tix View this printing FalloutExtended art
MTGO: 0.08 tix View this printing  FalloutExtended art
 Commander 2021
  Gatecrash
MTGO: 0.02 tix View this printingNo printings match. Try another edition, number, or treatment. Combos using this cardNo combos yet. Format legality
Rulings2013-01-24 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. Current Oracle text is shown for every printing.
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