Sakku-Oni, the Corrupter

Menace
When Sakku-oni, the Corrupter dies or is put
into exile from the battlefield, you may put it
into its owner's library third from the top.
Whenever Sakku-oni, the Corrupter enters the battlefield, you may return any number of
creature cards with total mana value 3 or less
from a graveyard to the battlefield.