Name:Biomass Mutation
ManaCost:X GU GU
Types:Instant
A:SP$ AnimateAll | Cost$ X GU GU | Power$ X | Toughness$ X | References$ X | ValidCards$ Creature.YouCtrl | SpellDescription$ Creatures you control become X/X until end of turn.
SVar:X:Count$xPaid
SVar:RemAIDeck:True
SVar:Picture:http://www.wizards.com/global/images/magic/general/biomass_mutation.jpg
Oracle:Creatures you control become X/X until end of turn.