When Kor Skyfisher enters the battlefield, return a permanent you control to its owner's hand.
3/14/2017 Kor Skyfisher’s 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.
3/14/2017 If Kor Skyfisher is still on the battlefield as its triggered ability resolves, you may return Kor Skyfisher itself.