I'm probably NOT the person who can give advice on improving the deck. What I would recommend is playing it and seeing where it falls short. To look at the cards and the sample hands I've drawn, I like the look, feel and synergy of the cards and the deck as a whole. My personal thought is that it seems a little mana-heavy, and I would probably swap out a couple of the lands, probably 2 of the fetch lands, for something else--like one more
Hero's Downfall and maybe a 4th Azban Charm.
I repeat, though, that I tend to think it is better to try to play a deck and see where it falls short and what works well with it, ideally in a casual friendly game but against a deck that would be competitive in Standard. If you don't have that kind of environment, you might want to test it against a pre-constructed deck. (I have been playing some of mine against the Elspeth vs Kiora decks and have been very disappointed in my attempts.)