Oblivion Maw

Menace
Whenever a creature with mana value 4 or less
blocks or is blocked by Oblivion Maw, exile that creature, then put X +1/+1 counters on Oblivion
Maw, where X is that creature's mana value.
Zombify {3}{b}{b}{b}{b} ({3}{b}{b}{b}{b}, Exile Oblivion
Maw from your graveyard: Create a token that's a
copy of it, except it's a Zombie in addition to its other
types.)