Demons of Endless Rage

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.)
{5}{b}{r}: Until end of turn, Demons of Endless
Rage loses undying and gains persist. (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.)
Bound eternally, by hatred and by contract.