Cemetery Brood

Whenever another creature you control dies,
put a number of -1/-1 counters on Cemetery
Brood equal to that creature's power.
When Cemetery Brood dies, return it to the
battlefield tapped with an additional -1/-1
counter on it, then create a token that's a copy
of it. Put a number of -1/-1 counters on that
token equal to the number of -1/-1 counters
on this creature