Heart of Light 
Enchantment — Aura
Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) Prevent all damage that would be dealt to and dealt by enchanted creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL