Undying Baron

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.)
Other creatures you control with -1/-1 counters
on them get +2/+1.
Hierarchy might seem pointless among the ranks of
the dead, but it still has an effect.