Muscle-Hat Wombat Demon

Trample, protection from white.
Whenever Muscle-Hat Wombat Demon attacks,
you may sacrifice a creature. If you do, put a
+1/+1 counter on Muscle-Hat Wombat Demon.
As long as there are five or more creature cards
in your graveyard, Muscle-Hat Wombat Demon
gets +2/+2 and gains lifelink.