Main goal: Use Momir to get Treasure Mage. Treasure Mage looks for Planar Portal. Use Planar Portal to search for Tooth and Nail. Cast Tooth and Nail Entwined as soon as possible, searching for Deadeye Navigator and Palinchron. Generate infinite mana, use Planar Portal to search for Enter the Infinite, and then go from there.
There is also a side combo with this deck that is pretty awesome, and if I've got the time while waiting for my first plan to go off (likely because someone's found a way to stop me): Play Cryptoplasm. Leave it as is until you get Progenitor Mimic. Have ProMimic copy Cryptoplasm. Get Clone, and have it copy the ProMimic. Get Deadeye Navigator, and soulbond it to ProMimic. From here, you can blink out the ProMimic, have it ETB as a copy of Clone, which then it gets twice the token producing abilities, re-soulbond it to Deadeye, blink out Deadeye and have it enter soulbonded to Clone. Blink out Clone, copy the ProMimic, soulbond back to Deadeye. Blink out Deadeye, soulbond back to ProMimic, and the process repeats again and again, as long as you have the mana. At your next upkeep, have Cryptoplasm as a copy of ProMimic with as many token producing abilities as you've set it to have. Cryptoplasm will be your "as is" Shapeshifter to keep things stable, it will never copy anything at every upkeep other than ProMimic. Have ProMimic and Clone make all their Cryptoplasm tokens, then you can change them to be whatever they want to be for the turn. At the end of the turn, you can continue the Deadeye blinking shenanigans to keep the tokens coming. The end result is that at EVERY SINGLE ONE of your upkeeps from this point on, ALL of the tokens generated from this can change to whatever they want to be AT EVERY SINGLE ONE of your upkeeps. With Doubling Season, this is absolutely bonkers. With the new Legendary rule change, you can have ALL the commanders. It's really rather fun to play out, but yes, takes a longer time and not exactly the way to win with Momir.
Momir can also win through damage, though not really Commander damage. Triumph of the Hordes, Akroma's Memorial, Melira, Craterhoof, and then with a lot of creatures on your battlefield, you can deal quite the impressive amount of damage. Ulamog and Kozilek are also great ways to go as a fail-safe against Mill. Mostly, everything else is mana production, seeing as Omniscience and Enter the Infinite are quite expensive. Lastly, I've built Momir with several "fail-safes," in case any combo is somehow impossible to continue. Biovisionary has even caught a few wins for me. Going Infinite before Omniscience could work, just make sure to put Omniscience on top of your library and have four mana to cast Unexpected Results to immediately put it on the field... Or, Djinn of Wishes and Magus of the Future can top-deck solutions as well. It's just basically a deck with several win conditions, all based upon what's happening in the game.
This deck is my favorite Commander deck I've built out of the eight I currently have. It is my best Commander deck as well, with an insanely great winning rate within my local play group... So much so that the players often complain that they want Momir banned from EDH, or heavily suggest I play a different commander, of which I will do. If you're wondering about the mana base with 31 lands and 40 creatures, here's why: Because Momir will LITERALLY get ANYTHING I want out of the deck, when I get my opening hand, I do nothing but Commander Mulligan until I get several lands, mana ramp spells, and/or have cards that involve the first path to winning. If Tooth and Nail is in opening hand, I just straight up Commander Mulligan to lands, ramp, and keep the Tooth and Nail. Spells, creatures, and Planeswalkers can eventually all be tutored through Planar Portal, and any attempt to kill the Planar Portal can be stopped with Venser/Voidslime/Draining Whelk/Plasm Capture/Mystic Snake, with three of those 5 capable of being tutored through creature spellcasting with Momir on field. Not saying it is unbeatable... Just that it's difficult to do so.