Flesh Agglomerate

Whenever a nontoken creature dies, exile it under
Flesh Agglomerate instead of putting it anywhere.
Flesh Agglomerate gets +X/+X, where X is the
number of cards exiled under it.
When Flesh Agglomerate dies, exile it. Then,
return all creature cards exiled under it to the
battlefield under their owner's control. They are
Zombies in addition to their other types.