Praedis, Cognomancer

+2: Target player puts the top three cards of their library into their graveyard.
+4: Draw two cards, then discard a card. Put the top X cards of your library into your graveyard, where X is the discarded cards mana cost.
-15: Target player discards their hand, shuffles their graveyard into their library, and puts the top fifty cards into their graveyard.