Treat Aurra as a Dark Jedi.
Pay 2 Force Evade 1
Whenever Aurra damages a unit and that unit is discarded, put the top card of your deck face down under Aurra. She gets +10 speed, +1 power, and +1 health for each face down card under her. (Face down cards are not in Aurra's stack.)
Version erratum
If a different version of Aurra is rotated to the top, the bonus would no longer apply. However, the face down units would stay with her, and they would apply again if Aurra (C) was put back on top. If Aura is taken out of play other than being discarded, such as returning to your hand, the face down cards remain set aside (out of play) until end of game.