Flying
Whenever Aetherstorm Roc or another creature enters the battlefield under your control, you get
![{e} {e}](/extstatic/symbol/other/e.svg)
(an energy counter).
Whenever Aetherstorm Roc attacks, you may pay
![{e} {e}](/extstatic/symbol/other/e.svg)
![{e} {e}](/extstatic/symbol/other/e.svg)
. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.