I would suggest adding Exquisite Blood to your deck. Same casting cost as sanguine bond and does the exact opposite setting up an almost infinite combo with Bloodchief Ascension+ Sanguine Bond. Just an alternative win condition for ur deck. Looks solid tho :)
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I would recommend Asceticism. A 5 cost enchantment that gives your creatures hexproof basically and makes it so you can regenerate them just by paying two is one way to keep your stuff from being removed either by combat damage or being countered. However it probably wont do much good if your playing against blue. But it is an option. Looks like a solid deck though.
I chose Axebane over Overgrown Battlement cuz for i more I can add mana in any combination of colors equal to # of defenders whereas Overgrown only adds green. I saw ur deck too and looks pretty amazing. I have so many defenders of red blue green and a couple good artifact defenders that I am not sure what to put lol
Looks pretty stable. Like the idea of being able to drop a 3 cost demon on turn one. The Sideboard combo with Abyssal and Trader is a sweet touch to add too. Also like the speed factor of this deck.