Ok so you've decided on a nearly creature less deck. MY question to you now is what is your intended play style with this deck? With U/B you'll be playing a mostly control deck. A few of your spells do either creature removal or can
cancel spells. But what is your win condition with the deck? Usually when playing U/B there are a few methods that come to mind for win conditions:
a) mill them out
b) be aggressive and
deal damage through combat
c) drain their life using spells (such as
alms of the vein)
d) or come up with a personal strategy that hasn't been tried yet
Having a good deck is one thing, but to take it a step further you have to give your deck a purpose when you go into battle against an opponent.