Overall what is your budget? I can give much more specific advice if I know your budget constraints. You will likely want to cut down the deck to 60 cards regardless.

My budget is approximately 5 dollars. I know it is not much but I've already invested lot of money to mtg and I don't want to invest more now...On the other hand, I have the Jace vs Vraska duel deck, which I can use to enhance this one.

Yeah, $5 is not much to work with. I guess the easiest way to help then is to go over archetypes where you frequently find Eldrazi.

The first archetype is called Tron. This also seems like it might be more in line with the archetype that you are trying to build here. Tron is a control deck that uses the urza lands (Urza's Mine, Urza's Power Plant, and Urza's Tower) to generate huge amounts of mana to then play big 7 drop spells on turn 3 or 4. It is an easy way to ramp into your big Eldrazi threats as it requires little build around being that the ramp is built into your lands. Tron is typically Mono Blue or Gruul (Red/Green), but you can easily make it in other colored variants.

The second archetype is more aggressive and can be tailored to also be rather midrangey. These shells abuse Eldrazi Mimic, Thought-Knot Seer, Endless One, Matter Reshaper, and Reality Smasher. This core of cards can make the deck very aggressive and is capable of setting up an intimidating board state of fatties rather quickly. It is commonly played in Bant (Blue/Green/White) colors for other aggressive eldrazi such as and Eldrazi Skyspawner, and Mist Intruder and cards such as Collected Company to further accelerate the board state. Other cards that could see play are Blight Herder, Void Grafter, Ruination Guide, Salvage Drone, and Blisterpod.

A third archetype is a fairly new one. But it uses effects that exile your opponent's spells and creatures and then process then with eldrazi processors such as Wasteland Strangler and Ulamog's Nullifier. Effects that are used to exile opponent's stuff are Path to Exile, Flickerwisp, Brain Maggot, Tidehollow Sculler, Delay, and Spell Queller.

The fourth archetype that I can think of revolves much less around Eldrazi, but still uses them rather effectively. This is Death and Taxes. A typically Orzhov (Black/White) shell that uses tax effects such as Leonin Arbiter and Aven Mindcensor to cripple your opponent while you destroy their creatures with Path to Exile and their mana base with Ghost Quarter -- which they have a difficult time responding to due to the heavy taxes you place on them. The deck runs lots of lands that tap for colorless mana. As such, playing cards like Thought-Knot Seer and Eldrazi Displacer is quite easy.

I bring up these archetypes because right now your deck is kind of all over the place. In order to make the deck more consistent, you need to cut down on the number of things the deck aims to do. It is very much sort of a Jack of all trades, master of none sort of thing. If your deck tries to do too much, it isn't going to be successful at any of those things. As such if you refine your deck to more closely resemble one of the above shells, then your deck will run much smoother. Again, it seems as though you might be aiming for more of a Tron-esque list where you ramp into big creatures. But I just want to make sure before I give suggestions for cuts, additions, and cards to aim for someday.

Thank you so much for this list, although I fear that I cannot build any of these...I play mtg casualy only and because of that my decks do not have to be that efficient (and expensive). On the other hand I would like to have rather consistent decks. So what I will probably do is that I will remove all control cards from the deck and add colorless ramp cards and cheap removal cards. It won't be as strong as decks you have mentioned but it will be sufficient for me :)

From the removed cards I'll build a control deck (probably Dimir or Sultai one).