When Emancipation Angel enters the battlefield, return a permanent you control to its owner's hand.
5/1/2012 The triggered ability doesn’t target a permanent. You choose which one to return to its owner’s hand as the ability resolves. No one can respond to the choice.
5/1/2012 If Emancipation Angel is still on the battlefield as its triggered ability resolves, you may return Emancipation Angel itself.