"I am bound to all my children. I share in their joys, I rage at their injuries."

Spirit Link

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Whenever enchanted creature deals damage, you gain that much life.

The List

"We are all inextricably linked, souls woven in tapestry."

Dominaria Remastered

Enchant creature
Whenever enchanted creature deals damage, you gain that much life.

Tenth Edition

The triggered ability triggers when the enchanted creature deals any damage, not only combat damage.

Unlike the lifelink ability, the ability of Spirit Link is a triggered ability that goes on the stack and may be responded to. Notably, if the enchanted creature deals damage at the same time you’re dealt enough damage to reduce your life total to 0 or less, you’ll lose the game before you can gain any life.