Just how hard is it to build a somewhat okay Mono colorless Eldrazi deck?

I got plenty of the BFZ and Oath Eldrazi like [[Kozilek, the great distortion]] and [[Ulamog, the ceaseless Hunger]], and a [[Emrakul, the promised end]]. I am looking into building a colorless deck with Kozi at the helm but I dont know how to make it good enough to deal with threats that pop up during play without dropping some major cash on cards, cash I do not have.

So I sort of want to hear from you guys what do you do to build a sort of "budgety" colorless deck with the Drazi from "frontier"?