I would try to eke out just a couple more ramp spells here with that average CMC of 3.5, Faeburrow Elder will tap for 3 mana at a time, Nature's Lore can grab nonbasic Forests like Mumuring Bosk for extra fixing.

Maybe a few more card advantage tools as well, Ulvenwald Observer and Abzan Beastmaster are creature options, otherwise Guardian Project and good old Harmonize would make solid inclusions as well.

Looking like a pretty solid list with lots of card advantage and ramp, and a fantastic mana curve to boot. Where this list could use some improvement is in the interaction category; 4 spot removals and 2 wraths is a bit too low, and makes you vulnerable to solitaire-style decks like combo or spellslinger.

Some cards that immediately come to mind are Thalia, Heretic Cathar, Thalia, Guardian of Thraben and Eiganjo, Seat of the Empire. The first two are cheap legendary creatures that impede ramp decks, haste decks, and spellslinger. Eiganjo, much like Witch Enchanter, is a sort of modal card that can serve as a land or removal if need be. Kambal, Consul of Allocation punishes spells-heavy lists hard. Teshar, Ancestor's Apostle recurs fodder on cast, which means that even with an otherwise empty board, you can get something from your yard for your legendary creature to sacrifice.

Path to Exile and Swords to Plowshares are the best bang for your buck removals white has access to; I'd make room for them as well.

Other random suggestions:

Elas il-Kor, Sadistic Pilgrim adds incidental life loss and gain as you're generating and sacrificing stuff. Bonus points for being legendary and a cheap rattlesnake effect.

Teysa Karlov unfortunately doesn't double up exploit triggers, but it does buffer your tokens defensively and double up any non-exploit death triggers.

Nasty End is a cheap synergistic one-shot card advantage effect.

Primevals' Glorious Rebirth is a solid way to bounce back from a boardwipe, or just outright recur everything you've lost over the course of the game.

Nice list, looks like a solid Temur build

I do think the average CMC of the deck is a little high though; I would try to cut some 3 and 4 drops and push up the 1s and 2s to make the opening turns more consistent. Birds of Paradise, Llanowar Elves, Elvish Mystic, Fyndhorn Elves, Goblin Anarchomancer, Sol Ring would go a long way to help start getting to be able to play the good stuff faster.

Alternatively, you could swing the other route, cut out all the 1-2 drops from the deck, and make this a Keruga, the Macrosage companion list, which turns into additional card advantage from the command zone.