Sweet. No Blood Tribute? I like seeing that in the Sanguine Bond decks with a few vampires. I guess the only vampires you have are the Nighthawks though, so never mind. Wow Felidar Sovereign and Sanguine Bond. You could win twice in the same turn haha. I would be scared to play against this deck. What about a Diabolic Tutor or two just to ensure the Sanguine Bond?

Yeah, I figured I'd put in a win condition for both colors in case of mana screwage, and I did have diabolics in here, but I just can't figure out what to remove for them lol

I built a life gain deck as well you can look at it for some suggestions, but otherwise you have a very nice deck yourself.