Seems too slow, especially in modern. In the time it takes you to get all the life gain going you're going to be far enough behind that it doesn't matter. Especially considering you have literally no creature removal or boardwipes, your opponent can just curve out his whole hand and keep hitting you with it. If you want massive lifegain and to nuke people with aetherflux, why not play cheerios? Seems better in every way.

our playgroup is fairly slow on the board and are normally focused on someone else so he just sorta exists and murders us all after we finish murdering each other.

you need Second Harvest I think

i love this idea man keep it up

Have you considered Growth Spasm? Although it isn't a consistent Eldrazi Spawn producer, Growth Spasm may help ensure you have all four mana for casting your main stuff. Also, I feel From Beyond could use a target to fetch possibly Hand of Emrakul or Broodwarden?

Otherwise, I love the idea of the deck. The Eldrazi monument is a nice touch!

I actually really like the idea of Broodwarden and I'm going to try to find a good place for it, I'm going to wait for Amonkhet though because I'm putting Throne of the God-Pharaoh in for sure and maybe some other cards depending on what else is coming. Thanks!