Genju of the Fields is a uncommon Enchantment — Aura card from Betrayers of Kamigawa (BOK), collector number 5. Current market price: $0.38 (foil $2.42), TCGplayer market prices via Scryfall.
Enchant Plains {2}: Until end of turn, enchanted Plains becomes a 2/5 white Spirit creature with "Whenever this creature deals damage, its controller gains that much life." It's still a land. When enchanted Plains is put into a graveyard, you may return this card from your graveyard to your hand.