Eldrazi Titans

I apologize if I seem too critical.

One thing I notice right away is a lack of consistency. If your win con is to reanimate eldrazi, you probably would want to more easily draw into cards that do so. Playing 4 Rise From The Graves wouldn't hurt, and playing a couple (or even playing 4) Necromantic Summons from Origins would make drawing into your combo much easier. There's also Ever After, which for one extra mana you can raise two Eldrazi (which is basically the end of the game if one wasn't enough).
I'd also probably add either 2 more Emrakul or Void Winnowner, or you could try to add two other Titans for variety and consistency, whichever you'd want. On some rare occasions you might even be able to cast Emrakul if the game drags out.

Another thing about this deck I noticed is that its creature base is a little strange. Goblin Dark-Dwellers seems a bit out of place and clunky, as I'd rather cast a Rise From The Graves any day, or at least a card that would get me closer to dumping an eldrazi into the bin, over a Dwellers. Dark-Dwellers just recasts removal or a Tormenting Voice for 5 mana (and while it does provide a 4/4 body, the current standard meta can either get rid of it with Languish, 3 instant-speed removal spells, or a Kozilek's Return). I'd rather just have 2 more spells that I could draw into and use right away than a Dark-Dwellers that can only cast things I've already used, especially if I can't find what I need yet.
The Homonculus seems sort of helpful, he's at the same speed as Leaf Gilder and other ok mana dorks. However, the fact he can act as a mana dork and then flip to make it easier to use counterspells is a bigger plus than they've got, so I think keeping him depends on how well he performs in match-ups. He may not stick around for long on the board, sadly.
I like Angler, but I think he's a bit slow. I'd almost say it'd be faster to use Pieces Of The Puzzle or Vessel Of Paramnesia, because you're at least drawing into something. He's also susceptible to most pieces of removal until he flips, and even then he can die to a Kozilek's Return trigger or Roast. I think Angler drags the deck down more than you'd want it to.

Now right away I can say that Convolute in the current standard meta would probably not be as efficient as Clash Of Wills, or wouldn't be as devastating as Spell Shrivel. You really don't even want your opponent to have a big creature or win con in their grave, because they'll probably take it back before you can steal it with Rise From The Grave. The exile part is a nice touch. Clash is only more efficient in that you may not have to spend 3 mana to counter a spell. There's not a lot of blue going around, so people playing ramp or Emerge are less inclined to hold back mana to pay costs.
Summary Dismissal is another counter spell you should look into. It's a great answer to Emrakul, Worldbreaker, or Bant Company since it counters abilities as well. I'd suggest a couple in your sideboard if not your main board. Keep in mind that planeswalkers use abilities as well.
Also, I like Shreds Of Insanity, but I think slimming it down to 2 should be fine. It might clunk up your hand, it might not, I don't really know. That would have to be decided in testing the deck.
And in case Ultimate Price doesn't cut it for you, some sideboard Ruinous Paths or swapping them out entirely (depending on your local meta) for Grasp Of Darkness should do the trick.
Duress can be good or bad depending on your opponent. If they're running a delirium-based deck, then you might consider other options like Transgress The Mind. A lot of people now choose to use Transgress instead of Duress entirely, and leave Duress in their sideboard for match-ups that aren't as grave-based. A lot of the competitive meta now though is at least somewhat Delirium-based to cast Emrakul, so it all depends on if you're staying local or trying to enter larger tournaments.

Void Shatter and Tormenting Voice are delightful cards with little downside.

I also really like Mirrorpool in this deck. Doubling your reanimate spells and maybe taking a creature from each graveyard could easily close out a game. If you decide to use Ever After though, it might clunk up your mana base more than another basic land would. I'd also recommend swapping your Wastes for Shivan Reefs. They'll still be able to create colorless mana with the upside of being able to create colored mana when you need it. Although I suppose Evolving Wilds can go get Wastes, so maybe you could do x2 Reefs and x1 Wastes too. Whatever works best.

Hope this helped!