Kethrona, The Spellthief

0: Each opponent exiles a card from his or her hand. Put a number of loyalty counters on Kethrona equal to the highest converted mana cost.
-X: Cast a non permanent card exiled with Kethrona with converted mana cost X. Then, put that card back into it's owner's hand.
0: Scry 1, then reveal the top card of your library. Kethrona loses loyalty equal to that cards converted mana cost.