Mothman

Flying
Devour 1
Ferocious - Mothman has menace as long as you control a creature with power 4 or greater.
Persist
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Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)