Aurelia, the Warleader

Oracle Text

Flying, vigilance, haste

Whenever Aurelia, the Warleader attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase.

Card Rulings

1/24/2013 You untap all creatures you control, including ones that aren’t attacking.
1/24/2013 You don’t have to attack with any creatures during the additional combat phase.
1/24/2013 If Aurelia is put onto the battlefield attacking, the triggered ability won’t trigger.