Flying Whenever Umara Raptor or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Umara Raptor.
Messenger, weapon, friend.
Official Rulings for Umara Raptor
10/1/2009 : This ability triggers on this creature entering the battlefield, so it will enter the battlefield with its unmodified power and toughness, and then receive a +1/+1 counter a short time later. It does not enter the battlefield with the +1/+1 counter already on it.