Sheoldred, Grafted Despot

At the beginning of your upkeep place a -1/-1
counter on target creature.
Whenever a creature dies, If it had a counter on
it, return it to the battlefield under your control
at the end of the turn.
Whenever a creature an opponent controls dies,
If it had a -1/-1 counter on it, put a -1/-1 counter
on target creature.