Your search for "Mountain 348" revealed the following:
Mountain (348) (SCD) from Starter Commander Decks, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Titus Lunter
Mountain (348) (C16) from Commander 2016, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Kev Walker
Mountain (345) (Foil) (8ED) from Eighth Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: John Avon
Gardevoir ex (Japanese) - 348/190 - Special Art Rare from SV4a: Shiny Treasure ex, available at 401 Games Canada. Rarity: Special Art Rare Finish: Holofoil Artist: N-DESIGN Inc. Card Text:Ability: Psychic Embrace As often as you like during your turn,...
Swamp (348) (Foil) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Larry Elmore