Cathar of Rebirth

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 Cathar of Rebirth enters the battlefield, if it has a +1/+1 counter on it, transform it.
As long as Cathar of Rebirth has no +1/+1 counter on it, it has protection from black.