So yes, as the title suggests, this Tatyova PDH deck is a combo build that aims to generate infinite mana, followed by a victory through Capsize or Wildheart Invoker. Of these two Capsize is the easiest win, as you can just clear your opponent's board and repeat the combo as necessary.
The two infinite mana combos of this deck are as follows:
If you have one of those combos, it is easier to use some creature with a draw cards effect to find everything else, than adding more wincons (you just blink that with your wizard). That said, Temporal fissure might be an idea: you just play a few cards and this bouncing some of their lands and a return wizard (maybe more of your stuff to replay though) and do that for a few turns and you won. Besides that it is basically the same as capsize after the combo - just bounce your return wizard too to get the fissure back.
I would use the mana accel land auras, such as wild growth and utopia sprawl over the small elves. There are also more expensive options I would consider if you are really aiming for these combos. This way you got your accel AND your lands that tap for more mana.
You can also use frantic search and rewind+another return wizard for the combo instead of the creatures (rewind requires something to counter but on the other hand if you can counter everything they got, you do not really need more), if your lands produce enough mana. This may be important since the creatures are hard to find.
Those are all excellent suggestions. Land auras make it easier to combo out, and Merchant Scroll is a great tutor. I always thought it was uncommon for some reason. I'll also have to find room for Muddle the Mixture, as it's the only pauper legal card (as far as I know) that can tutor for one of the untap pieces in the combo by transmuting to Cloud of Faeries.
Deck needs more High Tide. It would make it easier for you to combo out with your flickers, and I think it would be even more reliable then getting the tron. You need all 3 lands, and don't have that many tutors for them. High Tide is a single card, that can be tutored with Merchant Scroll and Dizzy Spell. Had a game where I recured it 3 times to make inifite without lands that tapped for 2. If you decide to go this route, I would suggest upping your basics island count - you should be able to fix your mana rather well without all the duals.
As yet another wincon, I also play Merrow Witsniper but I'm actually inclined to cut it since that once you get to your combo and infinite mana, you can play Tatyova (giving you can make G and U something tron doesn't do) to draw your deck. And winning from there should be pretty easy.
They just wouldn't be pauper legal...
But staying on the landsuggestion, I think you should increase basic islands. High Tide needs lots of them. You could either remove the tron or the loci - and I would cut the non-lifegain duals. You lose tempo with the cipt and your fixing is already excellent.