Biomass Mutation

Instant    (CMC:2)

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

187 C19 • ENDan Scott

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Modern,Extended,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Biomass Mutation {X}{G/U}{G/U} Instant Creatures you control become X/X until end of turn.

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1/24/2013
Choosing 0 as the value for X will likely cause creatures you control to become 0/0 and be put into the graveyard.
1/24/2013
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).

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