Your search for "Plains 366" revealed the following:
Plains (366) (4ED) from Fourth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jesper Myrfors Card Text:T: Add W to your mana pool.
Plains (366) (ICE) from Ice Age, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Christopher Rush Card Text:[W]
Plains (366) (Foil) (STX) from Strixhaven: School of Mages, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jonas De Ro Card Text:T: Add W.
Plains (366) (10E) from Tenth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Staples
Plains (366) (STX) from Strixhaven: School of Mages, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro Card Text:T: Add W.
Plains - Borderless (Foil) (REX) from Jurassic World Collection, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Véronique Meignaud
Plains (338) (C16) from Commander 2016, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Mark Poole
Plains (366) (Foil) (10E) from Tenth Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Greg Staples
Plains - Art Series (Gold-Stamped Signature) (ASNC) from New Capenna Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Elektrodeko
Plains (046) - The Tokyo Lands - Japanese (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Rosemary Valero-O'Connell Card Text: The Tokyo Lands
Clifftop Retreat (SOC) from Secrets of Strixhaven Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Christine Choi Card Text:This land enters tapped unless you control a Mountain or a Plains.T: Add R or W.