Your search for "Plains 256" revealed the following:
Plains (256) (CLU) from Ravnica: Clue Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: James Paick
Plains (256) (AKH) from Amonkhet, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro
Plains (256) (ORI) from Magic Origins, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Raoul Vitale
Plains (256) (Foil) (ORI) from Magic Origins, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Raoul Vitale
Plains (251) (ISD) from Innistrad, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Plains (2509) - Dungeons & Dragons®: Lands of the Forgotten Realms (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Arthur Yuan Card Text: Dungeons & Dragons: Lands of the Forgotten Realms
Officer (009) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Carlos Dattoli & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (013) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Gregg Schigiel & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (006) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Arthur Yuan & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (011) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Charles Chaisson & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (007) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Nia Kovalevski & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (008) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Nathaniel Himawan & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Officer (012) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Mushk Rizvi & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Plains - AKH Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro