Corpse Cavalier

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its
owner's control with a +1/+1 counter on it.)
When Corpse Cavalier enters the battlefield, you
may sacrifice another creature. If you do, another target creature gets -3/-3 until end of turn.
Even through death, it remains honor bound. Just as
long as its fed.