Adarielle, Combat Leader

Flying, vigilance, first strike, battle cry
Whenever you attack with three or more
creatures and Adarielle, Combat Leader is in
your graveyard, you may exert all attacking
creatures you control. If you do, return Adarielle
from your graveyard to the battlefield attacking.
"We are the most powerful military force in Fimaurel.
Even my death will not stop us from triumphing."