The Invisible Ghitu Link

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, it deals 2 damage to any target.

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.

Enchant creature Enchanted creature has phasing and can't be blocked except by Walls. (It phases in or out before its controller untaps during each of their untap steps. While it's phased out, it's treated as though it doesn't exist.)