"X Gon Give It To Ya"
My brother Sicohippy had a Xiahou Dun, the One-Eyed deck years ago, It's listed on tapped out as X Gon Give It To Ya (Xiahou-Dun Stax Primer)
This was a Cedh deck at the very beginning of the format. Its interesting to see how far Cedh has come in nearly a decade. I want to update my brothers deck with new prints and more optimal card choices that we have today to modernize the deck and see if it can still play at a Cedh table. Hopefully by playtesting this deck we can learn how good Xiahou really is and how good mono black is in commander.
This commander is off meta but I think he has a lot of potential to be brutal if you can drag the game out by using stax and control. Being off meta can be an advantage when opponents don't know when to interact with your win cons. I am not an experienced Cedh deck builder by any means yet so any upgrades I can make or other suggestions are always welcome. This commander thrives off infinite so efficient ways to make infinite colorless or black mana would surely be an upgrade to this deck if you can think of any. Also if there are better ways to hard lock the table maybe horsemanship can become a win con aswell.
Combos
Infinite Magus of the Coffers+Umbral Mantle or Staff of Domination can also draw your whole library with the Staff of Domination and gain infinite life.
Infinite Cabal Coffers+ Rings of Brighthearth + Deserted Temple
Infinite Rings of Brighthearth+Basalt Monolith+Deserted Temple+Swamp can sink your infinite colorless mana into making infinite black mana
instead.
Rings of Brighthearth+Basalt Monolith
Notable Synergies
Demonic Tutor (or ANY tutor, really)+Xiahou Dun, the One-Eyed alongside
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Play Basalt Monolith + Rings of Brighthearth to activate the unlimited colorless mana combo as described above.
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Play Demonic Tutor (or ANY tutor) to search for Chromatic Orrery.
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Use unlimited colorless mana to play Chromatic Orrery, You may now use your unlimited colorless mana as if it were black mana to play Xiahou Dun, the One-Eyed
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Sacrifice Xiahou Dun, the One-Eyed to return Demonic Tutor to your hand.
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Repeat infinite times, as you can now summon Xiahou Dun, the One-Eyed as many times as you want now that you have unlimited mana, and continually sacrifice him to search for a win con. This will work with any tutor, really. Note that if an opponent has counter magic or other such effects they will be completely useless once you pull this off. You can play every card in your library infinite times so if they hold up counter magic for the win con jokes on them just play it again using Xiahou.
Lethal Vapors+Pithing Needle name Lethal vapors and you have a lock on creatures which you run very few of. You can also summon Xiahou Dun, the One-Eyed and then respond to the Lethal Vapors trigger by sacrificing him to his own ability. This is much better now considering the ban of Flash so Protean Hulk has fallen out of favor you are less likely to enable an opponents combo.
Painter's Servant+Grindstone mills an opponent out, you can also add Rings of Brighthearth to kill 2 players per turn. Painters servant also lets you recur colorless cards with Xiahou Dun, the One-Eyed.
Contamination + Bitterblossom locks non black opponents out of mana.
Consensus atm is that this deck wins every game 1 or 2 turns later than it needs to to win the game. Any suggestions are welcomed to make it better somehow, I know it can be better, I think it has too many win cons given the infinite tutor combo ability of Xiahou Dun, the One-Eyed