Infinite mana

Fun combo indeed. Couple ways I see that can help. I'm actually going to propose a major change that should help quite a bit, followed by a bunch of small changes that play off that major change.

So, what you need for the combo to go off: 1- Isochron, 2- Dramatic Reversal,3- 3 mana per turn generated by artifacts/creatures tapping, and 4- your mana outlet (currently Blue Sun's Zenith).

The major change I see is dropping Blue Sun's Zenith as the win condition and using Razortip Whip and Twitching Doll instead. I say this for the following reasons:
1- both new wincons are searchable by the same thing as almost the entire other combo, whereas Zenith isn't (more on this below)
2- Twitching Doll is also a mana rock and ups the chances of your combo going off
3- both don't require specifically colored mana to activate, which frees up your mana rock options

The best part of this combo is that you can search a good chunk of its pieces with the same cards, which are both cheap and have a low mana cost. Your first and best search option is Muddle the Mixture, which lets you search Isochron, Reversal, your mana rocks, and your new win conditions (see above). Meaning, you can literally search any piece of the combo you want for 3 mana.

If you switch out the win cons (see above), the only card you can't search with artifact search is Reversal, which makes the combo (again) even more likely to go off, as you can search out almost every piece with the same search cards. Fabricate is your best bet, but it's 5 bucks (might be out of the price range), in which case go with Tribute Mage which fetches everything but Sol Ring and Reversal. Combined with Muddle, that's 8 fetch cards that are 3-drops that get you what you need.

I'd also cut Jaspera Sentinel, as it's hella conditional, and just go with some 1-drop blue tactics cards like Ponder, which thins the deck, gets you what you want, and can be played early to speed things up.

Your mana rocks can/need to be swapped around too, as you don't need blue anymore for the combo. I'd leave Simic Signet (you still have blue cards) and go with Talisman of Curiosity over the other two signets, as they get what you need done in a better fashion, and has an extra feature that helps the build.

As for Trinket Mage and Sol Ring, I say keep those, and add in 1 copy of Magma Mine that is fetchable by Trinket Mage, that way you can use it to fetch either your best mana rock or a win condition, again making the combo more likely to hit. (Magma Mine is a win condition that functions almost exactly the same as Razortip Whip in practicality, but is a 1-drop so it's not fetchable with Muddle, which is why I went with Razor as the primary win condition instead).

Since you need 3 mana from rocks, you can also run Everflowing Chalice and/or The Enigma Jewel // Locus of Enlightenment that are fetchable by a Trinket Mage that are double mana rocks (which makes the combo much easier to pull off, as you only need the 1 more mana), which also ups the chances of you drawing into one of them naturally.

I realize this is a LOT, but I used to make decks like this all the time, and it hit me with a little nostalgia. It literally might be easier for me to just make a deck showing what I'm talking about. If that's the case, I'd be happy to do so.

Not trying to say your build is bad, just suggesting some alternatives.