Ushi-Oni

Menace
Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This
permanent enters the battlefield with 2 +1/+1 counters on it for each creature sacrificed this
way.)
When ever Ushi-Oni is blocked put a -1/-1 on
that blocking creature. Whenever a creature that
had a -1/-1 counter on it dies proliferate.