Aurelia, Maiden of War

Reinforce {1}{w}{r} (Whenever two or more creatures
you control attack, you may pay {1}{w}{r}. If you do,
put this card onto the battlefield from your hand
tapped and attacking.)
Flying
When Aurelia, Maiden of War enters the battlefield, other creatures you control get +0/+2
and gain first strike and lifelink until end of turn.