I'd say take the construct but the rest of the deck looks nice Upvoted

Transgress the Mind would be great to deal with bombs, and it has devoid to profit from your creature's triggers. I like this deck +1

I'm sorry but i really hate Sludge Crawler. I think Swell of Growth, Atarka's Command, and Beastcaller Savant would all fill the slot better. other than that love the deck! Thinking of building a similar one for standard. I feel like blue actually has some decent aggro eldrazi too though so I am torn

I also think Dominator Drone would be pretty decent here in place of one Vile Aggregate and one Nettle Drone as it has the same power but is much stronger from a losing board. It blocks scions and deals two damage immediately to get around any blockers your opponents have as well as having ingest!

I'm sorry but one last thing. +2 Bane of Bala Ged and -2 Ulamog, the Ceaseless Hunger. The bane does the same thing if you give it hastes, but is cheaper on the wallet and the mana!

I think aggro eldrazi lists need to either have some fun with Collected Company and/or Ghostfire Blade. I've gone the ghostfire blade route and in 10 games against a friend's high end ally list I've won 8 through testing. Up to you man but if you're only running 3 drops then you know this deck is thirsty for some CoCo

Thanks for the suggestions everybody! I'm going to start messing around with some of the cards you guys have suggested and I'll update the deck with what I find.

Thanks everyone and by all means, keep reporting your results with this build or similar builds and making suggestions!

This is just a thought but you could try to take out a few cards add couple more lands(or not) and run a few animists awakening to get your mana out faster(or something like it) cause I play tested a about 10 ten times and it was tough getting a hand with enough lands in it.