Also, having only 4x green sources is probably not enough, I'd probably trim down on some utility lands (Cavern, Wreckage) or Wastes and and a couple more painlands (maybe Spire of Industry).
Since you splash green you can now add some SB cards like Nature's Claim now.
I've warmed up to running a copy of Ugin in the maindeck recently, against many decks you can just durdle around hit land drops and barely survive and then you topdeck Ugin and the game is over.
All is Dust/Ugin are pretty bad against "Bant Eldrazi" since they are (mostly, except for the mana dorks) colorless.
On average Affinity should be much faster than "Eldrazi Tron" (which also doesn't have much removal/disruption) and can regulary kill on turn 4 (or 3 with a really good draw).
I'd rather say they are heavily favored outside of a "nut draw" by "Eldrazi Tron".
If Bane gets to attack (and annihilate-exile 2) it has probably did it's job even if it dies, trading with a Goyf or Shadow doesn't sound too bad either as a 3-for-1 (they are unlikely to survive getting hit for 7, especially Goyf).
Also, any thoughts on Myr Battlesphere ?
It is probably a bit underpowered but who knows.
Is Ratchet Bomb necessary in the maindeck ? I'd probably keep some Mind Stones there.
Also, having only 4x green sources is probably not enough, I'd probably trim down on some utility lands (Cavern, Wreckage) or Wastes and and a couple more painlands (maybe Spire of Industry).
Since you splash green you can now add some SB cards like Nature's Claim now.
How is it better than a dual painland (or Spire of Industry) ?
The +3/+3 ability seems mostly irrelevant.
It is worse than Tormod's Crypt for the most part as well imho if you want something that doesn't conflict with a Chalice on 1.
Grasping Dunes is basically a worse version of Quicksand.
On average Affinity should be much faster than "Eldrazi Tron" (which also doesn't have much removal/disruption) and can regulary kill on turn 4 (or 3 with a really good draw).
I'd rather say they are heavily favored outside of a "nut draw" by "Eldrazi Tron".
Also, any thoughts on Myr Battlesphere ?
It is probably a bit underpowered but who knows.
What about Myr Battlesphere as another 7-drop ?
It can clog the board and deal a lot of damage (attack for 8 + ping for 4).
Since Dismember is on the downswing after the printing of Fatal Push, is Bane of Bala Ged a more reasonable option now ?
http://www.starcitygames.com/article/34644_Which-Type-Of-Eldrazi-Build-Suits-You.html
Your curve seems too high.
Emrakul, the Aeons Torn is too expensive to cast even in Tron.
Without quick Tron or Chalice I can see this list struggling to cast anything (besides E.Map and M.Reshaper) before turn 4.