Relentless Deathwalker

At the beginning of your upkeep, remove a -1/-1 counter from Relentless Deathwalker.
When Relentless Deathwalker dies, if it had no -1/-1 counters on it, return it to the battlefield at the beginning of your next end step with two -1/-1 counters.
Morbid — When Relentless Deathwalker enters the battlefield, if a creature died this turn, destroy target creature.