I would cut Duty-Bound Dead and Guardians of Akrasa . A little bit of exalted goes a long way and I think you would want some more creatures that want to attack. look for intimidate, flying, unblockable, and trample (if you add green or maybe something in black has it). But what you REALLY want is more removal. Tragic Slip , Murder , Ultimate Price are all playable kills spells.

Another idea is Rest in Peace . When you only attack with one creature and the other player can block with undying, or reuse removal spells it could get a little tough. If you end up trying this switch Lingering Souls to Midnight Haunting

4x Isolated Chapel is a must.

Drop Nefarox. He's too slow. You should be winning on your fifth or sixth turn, not just starting to play your big spells. 4x Sublime Archangel is a must, too. Silverblade Paladin works extraordinarily well with Exalted.