I did build this, and then made it modern... Vampiric rites looks good! Thanks for the tip.
Youll have to play against it!

I just logged into deckbox to make a black, white deck that is basically the same as this one, then I saw yours. It must be a very good deck type if we both thought of it.
I would add Vampiric Rites or Alter's Reap for draw.
Vampiric Rites won me the pre release because it allows you to daw when you are chump blocking and you gain life.
I also have a foil Zuliport Cutthroat if you want it. It's a $3 card and you can probably use it better than me if you make this deck.