Royal Revenant

Graft On {b}{g}(You may cast spells with Graft On
from your graveyard. If you cast this spell for its
Graft On cost, put it under target creature you control.
They merge into the creature on top plus all abilities
from under it.)

Deathtouch

If a player gains life put that many -1/-1 counters on
Royal Revenant.