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.
Rise and Shine - Sketch Showcase (Foil) (MH2) from Modern Horizons 2, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Franz Vohwinkel Card Text:Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on...
Mountain (340) (Foil) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: John Avon