Your search for "Plains 157" revealed the following:
Plains (157) (S99) from Starter 1999, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Fred Fields Card Text:W
Plains - Prerelease Promo (Foil) (PDGM) from Dragon's Maze, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Eric Deschamps