Grendel, the Gourmand

Grendel's power is equal to the number of exiled cards, if 5 or more creatures were exiled by Grendel he gets trample

Feast— When Grendel enters the battlefield, choose up to X creatures. Exile those creatures with 3 Digest counters

Whenever a source deals Damage to Grendel, that sources controller may cast an exiled card they own with a Digest counter on it