Zorak, Destruction Engine

+2: Choose a creature card in your graveyard, then target opponent loses X life and you gain X life, where X is the mana value of that card.
-3: Look at the top seven cards of target players's library. separate them into two piles, put one in their graveyard, and exile the other
-7: choose a creature card in exile and a creature card in a graveyard, then put them both on to the battlefield under your control.