Biomass Mutation [Duskmourn: House of Horror Commander]

Set: Duskmourn: House of Horror Commander Type: Instant Rarity: Rare Cost: {X}{G/U}{G/U} 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