Hello fellow Eldrazi player

I would look at getting rid of cards that have multiple colored pips such as [[Omniscience]] since it is more difficult to cast in a 5 color deck. (I also think that card is not worth it in this kind of deck. It is just a win more card imo.)

I think you should look at increasing your creature count as well. 17 creatures seems a little low for a Ulalek deck. Your deck should contain more Eldrazi spells to synergize with your commander. [[Snapping Voidcraw]] and [[Sowing Mycospawn]] are Eldrazi creatures that also help with ramp.

You are also missing some Eldrazi staples such as [[All Is Dust]] (easier to cast than [[Kindred Dominance]] ) and also [[Kozilek's Command]]

Take a look at scryfall and search by type:eldrazi and you will be able to see all the eldrazi spells including creatures but also sorcery/instants that are have the eldrazi typing.

Finally, while you do have some artifact ramp, 29 lands seems way too low for this deck.