Hey, I just wanted to give my two cents.
The last two cards I would consider (Although a bit pricey) would be Spellskite to redirect their targets and Grand Abolisher to stop them from trying to counter your spells or play combat tricks when you attack.
I've been looking to make a similar type of deck and I like the framework you've put together. +1
May 8, 2017 9:15 p.m.
You may like Aegis of the Gods for Silent Arbiter so you can't be burned out, Nyx-Fleece Ram for Wall of Frost so you can get life gain, and Heliod, God of the Sun for Dovin Baan to keep Dragonlord Ojutai hexproof when attacking.
May 8, 2017 9:34 p.m.
Thank you GTaigrs your feedback was very insightful and constructive as you can see I took some of your advice I liked the idea of replacing Wall of Frost for Nyx-Fleece Ram along with sphere of saftey with Norn's Annex.