Schrodinger, Quanta Dr.

: At the beginning of your end step, if Schrodinger entered the battlefield this turn, she phases out.
+1: Return target creature to its owner's hand. If the creature had a converted mana cost of 5 or more, put a loyalty counter on Schrodinger.
-10: Return Schrodinger to your hand, then draw cards until you have 9 cards in hand. Spells you cast cost 2 less until end of turn.