Mesa Enchantress could be a good addition as she helps to counter the card advantage risk you run with aura's. Maybe some more exalted creatures to capitalize on the effect of the sovereigns? Looks like a good start.
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Ball lightning is a rare. Otherwise it looks alright.
Very nice to see an enchantment based deck. Mesa Enchantress can provide some awesome card advantage in this.
You need to look at fabricate, mycosynth golem, and darksteel colussus. I would drop the tooth and scales of chiss goria. The islands too and maybe the chromatic spheres in favor of 4 x fabricate, 4 x mycosynth golem and 2 x darksteel colussus.
I've found that armament master looks good on paper but fails in practice, I'd drop him altogether. I'd also look at switching the magebane armors and cloaks for 3xkitesail, 3xbasilisk collar and another behemoth sledge if you can. Would benefit from path to exile to. Very strong core of kor though :)
I would drop the coat of arms, one of the captains of the watch and the skyfishers. Add two more path to exiles, two rangers of eos and two martial coups, It should lay down beats fast enough to not need the Captains.
I would look at adding some kor skyfishers, return an ally to your hand then play it again using the mass mana generated with you harabaz druids.
If it was me I would have 4 of the duelists and 4 of the kitesails. Make it 4 bonesaws and basilisk collars if you can. I'd be tempted to drop the skyfishers and hookmasters and sideboard the lightcasters. Trusty machete could also be worth be a look. This could make the deck a little faster and a potential turn 2 doublestrike 2/1 is just too sweet.
I like the idea of this deck a lot, I tried running a pure red burn but couldn't keep up speed. If you want to keep it standard then searing blaze could work nicely, if not needle drop is a nice little surprise as is grapeshot. Definitely going to try something very similar.
I ran a very similar deck but instead of the fire-bellies I used elvish harbinger, Gets you a changeling when you want it and taps for mana. Having only one of the Giant and treefolk Harbingers seems a little pointless to me, either replace them with another sunrise sovereign and timber protector respectively or swap something out for more harbingers. Hope it works out for you either way.