Your search for "Plains 343" revealed the following:
Plains (343) (Foil) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Rob Alexander
Plains (340) (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andreas Rocha
Plains (317) (TRK) from Star Trek, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Bastien Grivet
Plains (343) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Rob Alexander