The idea with this deck is to gain life and kill your opponent with Sanguine Bond. With extort and SB, you gain 1 life and the opponent loses 2, Corrupt deals double damage. Crypt ghast should provide plenty of mana to get off several extorts with any spell cast, and Liliana will help get those swamps out.

The maybe-board: This is essentially an alternate build. The idea is to get unblockable/intimdate creatures and buff them up with lifelink. You deal damage and gain life, triggering Sanguine Bond.