Green definitely helps for mana fixing, no doubt about it. The thing is, I'm stupid and stubborn about the way I build decks: I always have a theme, I don't put any rares or mythics in, and I only use cards from one set or block. So, as soon as I was told what Eldrazi was kinda about, I decided, okay, this one is going to be The Hurt Locker. And, so, based on that, I had to limit my colour choice to those that fit the name of the deck, which limited me to red, black, and white. So, you're right that I should run green, I'm just never going to do it.
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There are two reasons these cards aren't in. A) this deck only has commons, and B) I limited myself to only cards from the Alara block. But yes, that would probably be good. Some day, if I make a proper deck, they'll go in :P.
I really should, you're right. The reason it's not in there is because I made this by going through my local game store's playsets of commons, and, of course, all of the terminates had been snapped up.
I also have mixed feelings about having the terramorphics in the deck. They're there for the reasons Drakedew and Irrelevant said, but I think maybe there's a better way to use those slots. What do you think I should put in instead?