Your search for "biomass mutation 209" revealed the following:
Biomass Mutation (C21) from Commander 2021, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (C19) from Commander 2019, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (GTC) from Gatecrash, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control become X/X until end of turn.
Biomass Mutation - Extended Art (Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (Foil) (GTC) from Gatecrash, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Dan Murayama Scott Card Text:Creatures you control become X/X until end of turn.
Biomass Mutation (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (SOC) from Secrets of Strixhaven Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (DSC) from Duskmourn: House of Horror Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation - GTC Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Dan Murayama Scott Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation - Extended Art (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.
Biomass Mutation - Extended Art (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Nicholas Gregory Card Text:Creatures you control have base power and toughness X/X until end of turn.