As an additional cost to cast this spell, exile a creature you control.

Return target creature card from your graveyard to the battlefield. Put a +2/+2 counter on that creature if the exiled creature was a Thrull.

Rulings

Putting a counter on the creature put onto the battlefield is not a targeted effect and so Protection from Black will not prevent it.2004-10-04
You exile exactly one creature. You can’t exile more than one in an attempt to get a larger effect.2004-10-04