My advice: First, get a spawnsire of ulamog or two, maybe even three. Then sideboard all your big eldrazi creatures and replace them with mana ramp. You could switch out your broodwardens for coat of arms(coat of arms is crazy if you get lots of spawn out). Use your mana ramp and spawn to activate your spawnsire's ability to put all your eldrazi creatures in the game. Other cards that would be good to throw in this deck: Quicksilver Amulet (to get out big creatures faster), Ashnod's Alter(to make your spawn sac for more), Gelatinous Gensesis (has nothing to do with eldrazi but combos really well with parrallell lives, eldrazi monument and/or coat of arms), Banefire (if you put ramp in, put in this card too), Worldly Tutor (excellent combo with descendents path, especially in an eldrazi deck) These cards could get you infinite mana if you get a spawnsire two parallel lives or a spawnsire with parrallel lives and ashnod's alter. I don't know if this is exactly the direction you want to take this deck, but ramp would make it faster, which usually helps with winning, and a spawnsire would get all of your big eldrazi out at once from your sideboard and consequentially open up room to make a more streamlined deck. If you aren't interested in changing your deck so much, putting in four worldly tutors would still be a great idea. Hope this helps, like your deck by the way, maybe I'll put up the decklist for my red green eldrazi deck sometime
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