Originally, the average hand lands Unesh in played around turn 4-5, and ideally at instant speed. From here, sphinxes are cheap and dig into value engines such as Panharmonicon or Mirror Mockery and the relatively sparse interaction. If the engine keeps running, 1-2 turns later has a large sky-swarm of sphinxes (let's call it a riddle of sphinxes) and has looked through most of its deck. Eventually either discarding or not choosing Ulamog reshuffles the graveyard and the digging continues. With either enough triggers from raw casts, flickering via Cloudstone Curio, or turning thopters into sphinxes the deck can see it's entire deck or more every turn. With the reshuffle, this results in infinite turns off the singleton Time Warp.
UPDATE November 2021: My local group has begun playing some games at the cEDH power level, and what started as a joke has transformed into me considering this deck as my CEDH deck. This is only effective because we nearly always have 1-2 players on stax, and 1-2 players on control. By occupying the portion of the metagame with moderate control and significantly less disruption from the common stax pieces, as well as being midrange enough to race the more aggressive decks, Unesh can win its share of games. The required a somewhat significant retooling of the mana, but the deck does remain sphinx tribal and still only wins via combat damage (while taking infinite turns/sphinx storm). If the metagame included even one player on Torpor Orb effects or board wipes, the deck likely wouldn't be able keep up. Similarly if it was against 3 extremely fast decks. I'm not going to claim that this is cEDH viable, just that it works well in my opponent's blind spots.
Word of warning: while the method of card advantage is entirely dependent on your opponents, some specifically don't want to be chosen and will despise playing against this deck due to it's durdly nature and longer turns.
Commander
Even More Unesh
Sphinxes
"Sphinx" Clones
Technically not Sphinxes
Interaction - Counter
It's basically blue extra combats
Unesh Enablers
Ramp - Out Unesh
A point that is not immediately obvious is that Unesh can tolerate a somewhat higher count of cards which are partially or completely undesirable outside your starting hand. Nearly all of my card advantage comes from the Unesh EtB triggers, so drawing something like Jeweled Lotus later as part of a pile is not much of a drawback. This also lets me feel much lower drawback for something like Leyline of Anticipation or Gemstone Caverns.
The same drawback mitigation is true for the high MV artifacts such as Vedalken Orrery and Caged Sun. They can be sent to the graveyard for Scholar of the Lost Trove while selecting more immediately relevant spells.