Name:Aetherstorm Roc
ManaCost:2 W W
Types:Creature Bird
PT:3/3
K:Flying
T:Mode$ ChangesZone | ValidCard$ Card.Self | Origin$ Any | Destination$ Battlefield | Execute$ TrigEnergy | TriggerZones$ Battlefield | TriggerDescription$ Whenever CARDNAME or another creature enters the battlefield under your control, you get {E} (an energy counter).
T:Mode$ ChangesZone | ValidCard$ Creature.Other+YouCtrl | Origin$ Any | Destination$ Battlefield | Execute$ TrigEnergy | TriggerZones$ Battlefield | Secondary$ True | TriggerDescription$ Whenever CARDNAME or another creature enters the battlefield under your control, you get {E} (an energy counter).
SVar:TrigEnergy:DB$ PutCounter | Defined$ You | CounterType$ ENERGY | CounterNum$ 1
T:Mode$ Attacks | ValidCard$ Card.Self | Execute$ TrigPutCounter | TriggerDescription$ Whenever CARDNAME attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.
SVar:TrigPutCounter:AB$ PutCounter | Cost$ PayEnergy<2> | CounterType$ P1P1 | CounterNum$ 1 | SubAbility$ DBTap 
SVar:DBTap:DB$Tap | ValidTgts$ Creature | TargetsWithDefinedController$ TriggeredDefendingPlayer | TargetMin$ 0 | TargetMax$ 1 | TgtPrompt$ Select target creature defending player controls 
SVar:Picture:http://www.wizards.com/global/images/magic/general/aetherstorm_roc.jpg
Oracle:Flying\nWhenever Aetherstorm Roc or another creature enters the battlefield under your control, you get {E} (an energy counter).\nWhenever Aetherstorm Roc attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.