Your search for "Swamp 1941" revealed the following:
Swamp (1947) - Flower Power (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Ashley Dreyfus Card Text: Flower Power
Officer (011) // New Planet Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Charles Chaisson & David Frasheski Card Text:New Planet: {T}: Add one mana of any color.
Swamp (1941) - SpongeBob SquarePants: Lands Under the Sea (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Jon Vermilyea Card Text: Zippy Zombies
Swamp (1941) - SpongeBob SquarePants: Lands Under the Sea (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Jon Vermilyea