Flash (You may cast this spell any time you could cast an instant.)
When Whitemane Lion enters the battlefield, return a creature you control to its owner's hand.
6/8/2016 You may return this creature itself to its owner’s hand as its triggered ability resolves. If you don’t control enough other creatures, you must return it.
6/8/2016 The ability doesn’t target any creature. You don’t choose what to return until the ability resolves. Once the ability has started to resolve, no one can respond to the choice.