Eldrazi Besieged [Budget]

this is assuming that your biggest cost constraints are primeval titan, wurmcoil engine, and all is dust. the large variety of single creatures are there to adapt to different strategies, whether that be needing the pelakka wurm obstinate baloth against faster aggro decks where youll need the life gain, thrun vs control, hellkites vs flying weenies [except for baneslayer]. its been a long work in progress. the slagwurms can also be boarded against infect decks, and the veils and vines are there for obvious reasons. om-nom is for early ramp if you need it. altogether, the green suns really make this deck relatively viable over just 4 faunas. comments? what do you think would work better?