Biomass Mutation
 
Community Rating:
0.51.01.52.02.53.03.54.04.55.0
Community Rating: 3.487 / 5  (77 votes)
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Card Name:
Biomass Mutation
Mana Cost:
Variable ColorlessGreen or BlueGreen or Blue
Converted Mana Cost:
2

Types:
Instant
Card Text:
Creatures you control become X/X until end of turn.
Flavor Text:
"A regression to ancient forms? A glimpse of future evolutions? Or a fleeting alteration of the present?"
—Vorel of the Hull Clade
Watermark:
Simic
Expansion:
Rarity:
Rare
Card Number:
213
Artist:
Rulings
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).