Cultist's Familiar

Unleash (You may have this creature enter the battlefield with a +1/+1 counter. It can't block as long as it has a +1/+1 counter on it.)\
{b}{r}{t}, Sacrifice Cultist's Familiar: Each opponent discards a card for each creature that died this turn. Activate this ability only if Cultist's Familiar has
a +1/+1 counter on it.