Jace, Vryn's Prodigy

: Draw a card, then discard a card. If there are five or more cards in your graveyard, exile Jace, then return him to the battlefield transformed under his owner's control.

: Up to one target creature gets −2/-0 until your next turn.

: You may cast target instant or sorcery card from your graveyard this turn. If that spell would be put into your graveyard, exile it instead.

: You get an emblem with "Whenever you cast a spell, target opponent mills five cards."