Spirit Loop is a uncommon Enchantment — Aura card from Time Spiral (TSP), collector number 42. Current market price: $7.63 (foil $34.38), TCGplayer market prices via Scryfall.
Enchant creature you control Whenever enchanted creature deals damage, you gain that much life. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.