Nidus, Plague Bearer

Energize 1 —When Nidus, Plague Bearer enters
the battlefield, you get {e}.
Pay {e}: Return target creature an opponent
controls to its owner's hand. Put a mutation
counter on Nidus, Plague Bearer.
Remove 3 mutation counters from Nidus,
Plague Bearer: Create three 1/1 black Infested
Maggot creature tokens with wither.