Darius

This deck is pretty straight forward, but I'd remove all the Burning-Tree Emissaries and 2 Courser of Kruphix and add 6 more lands.
And if you're going for devotion I'd add one more Swordwise Centaur and remove one Brushstrider.
You can also add more high-cost creatures, or do you want to go for low-cost swarming?

Wow, I didn't notice bloodrush+birds combo, nice one!

You got a point, Ezuri and Genesis Wave are a good way to spend your mana.

I never really understood the use of Birds of Paradise outside of a triple colour deck.
I would remove those and add high power creatures.
Oh, and one mountain is a bit risky.
Besides that it's pretty solid if you ask me.

I really think that you should add more high-cost creatures.
You got a huge influx of mana with all those elves and it'd just be a waste.

I would add more stronger creatures.
Some more high-cost beasts would be easy to summon with all those mana abilities.
And have you thought about adding Door of Destinies?