IMO if you are running the Overgrown Battlement s, you should be running 4x Wall of Tanglecord aswell. And maybe some Wall of Vines too. Reasons being, it'll help against flyers, provide strong defense on the ground too, and will make your battlements tap for more.Now, as for what to remove, most of the land fetching is pretty unnecessary, as the tiny amount of extra mana can easily be gained by the battlements while the slots are used in your defense instead. Also, Skittering Invasion is not a terrific card. Awakening Zone would serve you much better in its stead.
here take a look at my deck: http://tappedout.net/mtg-decks/summoning-trap-5/
you wanna run 3 main eldrazi: 1 Emrakul, the Aeons Torn , 1 Ulamog, the Infinite Gyre and 1 Kozilek, Butcher of Truth . as for the ramp, you want 4Explore , 4Harrow 4Joraga Treespeaker 4Overgrown Battlement . 3 Garruk Wildspeaker 4Primeval Titan 4Vorinclex, Voice of Hunger 3Beast Within for creature removal, and i run 4Summoning Trap for big creature ramping on turn 3. 11Forest 4Tectonic Edge 1 Eye of Ugin 1 Mystifying Maze 3Eldrazi Temple and 3Khalni Garden
Just pulled a major overhaul on the deck took out alot and changed some stuff.
Remember the power of It That Betrays . Easily my favorite eldrazi.
it is a very well balanced deck but the one that i created (even though it has about 110 cards) i am able to get my big eldrazi's out and win the entire match in about 6-7 turns. the only reason i keep the deck that large is because i play against a lot of "mill-out" decks (a deck in which your opponent forces you to basically discard your entire deck).