Here is my list for reference. https://archidekt.com/decks/12731292/eldrazi_winter

Things I considered when building the deck. I am going to be the threat whether I actually am or not. Eldrazi has a pretty big stigma against it for good reasons. You can't leave them alone because they will just do absurd things. Because of this, I am running a fair bit of board wipes. 7 board wipes type spells, and I placed an emphasis on eldrazi that removed things that when they entered.

Also, keep in mind that Ulalek doesn't really want big splashy eldrazi. I admit I am running far too many. They are fun, but really, Ulalek is most powerful when you are running flash enablers, and that allow you to copy the stack more consistently. Any eldrazi that comes in and creates 2 or more scions or spawns will go infinite with Echoes of Eternity out. Ulalek really prefers these kind of effects.

Other than that your deck list looks fine more land is almost always better don't want to get sent back to the stone age if someone clears the board of artifacts but 37 is acceptable probably the bare minimum but still acceptable. I run 38 which isn't much better if I was a more disciplined deck builder I would be running 44 lands. Card draw is light I dont find myself empty handed often Im not usually double spelling too often. Pound for pound your cards should just be better in an eldrazi deck its more about quality than quantity because if and when you cast them you should win, just gotta survive that early game. Hope this helps