Spirit Loop 
Enchantment — Aura
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL