Your search for "Four Knocks 340" revealed the following:
Island (340) (SCD) from Starter Commander Decks, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Eytan Zana
Swamp (340) (Foil) (ONS) from Onslaught, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Doug Chaffee
Swamp (340) (Foil) (INV) from Invasion, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Rob Alexander
Swamp (340) (Foil) (ODY) from Odyssey, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Arnie Swekel
Four Knocks - Extended Art (WHO) from Doctor Who, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Darren Tan Card Text:Vanishing 4At the beginning of your precombat main phase, draw a card.
Victini (Japanese) - 340/SM-P - Promo from SM-P: Sun & Moon Promos, available at 401 Games Canada. Rarity: Promo Finish: Holofoil Artist: Mizue Card Text:[Fire] Victory SignSearch your deck for up to 2 basic Energy cards of different types and...
Mountain (340) (Foil) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: John Avon