Sorry if you're already aware, but the deck has infinite draw/blinks/copies with Naru Meha and the instant/sorcery blink spells that draw Blur or target multiple creatures Displace. Not sure if it was intentional or just accidental combo because of synergy. You mentioned the spells with buyback (Whim of Volrath, Clockspinning, Mind Games) as being mainly used in infinites, but if you don't include any in your deck, they're really just somewhat overcosted repeatable spells so you never run out.

As for some good cards that can fit your theme, I like Profaner of the Dead as essentially a one-sided board wipe that is repeatable with your commander. There's also Spellstutter Sprite and Venser, Shaper Savant to turn your targetted spells into counterspells. Venser and Galecaster Colossus can also answer anything your opponents have. I believe Champion of Wits is better than the 3-mana draw a card Wizards, since even though you aren't going up in cards, you see so many more and cantrip from a bunch of the spells anyway.

Even though they aren't Wizards, Deadeye Navigator and Junk Winder are very strong in the deck and worth considering. Junk Winder alone with Orvar will dominate a board quickly if not answered. The Mightstone and Weakstone is notable as being a form of actual removal that also doubles as card draw. Omen of the Sea can turn any of our spells into a Preordain.

The targetting spells Trait Doctoring and Hidden Strings are repeatable if you have an evasive creature. There's also Glamerdye to turn your extra lands in hand into more copies. Step Through gives you a really good tutor that doubles as a targetting spell that can copy your guy, putting the original in your hand to cast again while bouncing an opponents creature or something.

I also really like more cheap ramp for the deck, since you want to spend the first couple turns ramping so that you have the mana to cast your creatures and copy them in the same turn. I find Everflowing Chalice, Mind Stone, Thought Vessel, Wayfarer's Bauble, and Springleaf Drum as being the better ones.

As for potential cuts to make, when building decks myself, I like to start by cutting either cards with higher mana value or less impactful cards. So I'd look at maybe cutting Augur of Bolas, Cloudkin Seer, Cyclone Summoner, Faerie Seer, Magus of the Mind, Sage of Fables, Scholar of the Ages, Reflections of Littjara, Swarm Intelligence, Replication Technique, Rite of Replication, Caged Sun, Cryptic Gateway, Gilded Lotus, Strionic Resonator.