Genju of the Fens is a uncommon Enchantment — Aura card from The List (PLST), collector number DDD-47. Current market price: $0.24, TCGplayer market prices via Scryfall.
Enchant Swamp {2}: Until end of turn, enchanted Swamp becomes a 2/2 black Spirit creature with "{B}: This creature gets +1/+1 until end of turn." It's still a land. When enchanted Swamp is put into a graveyard, you may return this card from your graveyard to your hand.