Soul Link 
Enchantment — Aura
Enchant creature Whenever enchanted creature deals damage, you gain that much life. Whenever enchanted creature is dealt damage, you gain that much life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL