Mute Corpse

Deathless (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield with a -1/-1 counter on it. It becomes a Zombie in addition to its
other types.)

"Even the lowliest of the castes in the Tribe of
Undeath are annoyingly persistent. No matter how
many times you kill one, they just keep coming, all
without the joy of watching them suffer."
- Rexxes, Warjester King