Jace, Arcbound Apprentice

: If Jace would leave the battlefield, you may instead exile him and return him to the battlefield transformed under your control.
+2: Until your next turn, creatures your opponents control attack Jace if able. Scry 1.
0: Exile the top card of target player's library. Until end of turn, you may cast that card and spend mana as if it were any color to cast it.