Primordial Reaper

Devoid, flying, smite {2}{c} (Whenever a creature dealt combat damage by this creature this turn dies, you may pay this creature's smite cost. If you do, exile that creature instead.)
Whenever Primordial Reaper exiles a creature, you gain 2 life.
"First of the dead, this Primordial Reaper rules over the death of all life. It silently floats to the corpses of fallen humans to transfer their souls"