Zerniak, Soul Binder

Deathtouch, 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.)
Whenever another nontoken creature enters the battlefield under your control, you may have that creature enter with a -1/-1 counter on it. If you do, create a 1/1 blue and black Skeleton creature token with deathtouch.