+1: Target player puts the top two cards of their library into their graveyard. Draw a card.
−8: Draw seven cards. Then if your library has no cards in it, you win the game.
Demonic Consultation to mill your whole deck, then use the +1 ability and win.
Probably great for combo and comander players, but drawing a crad each turn and milling 2 might not be enought for modern or legacy. Some mono U-decks might use him instead Jace, the Mind Sculptor for budget reasons or when deamanding some cards in graveyard. Getting mill 2 and draw a card each turn might be a nice synergy with dredge cards, Bloodghast, Narcomoeba....