How It Wins

Weaken your opponents' board presence (and often your own) with global -1/-1 effects whilst bolstering your zombie commander and army, then take out your opponents with the dark horde you have amassed.
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Infinite Combos

• Ayara, First of Locthwain + Plague of Vermin = https://edhrec.com/combos/b/442

• Gravecrawler + Phyrexian Altar + Ayara, First of Locthwain = https://edhrec.com/combos/b/4461

• Gravecrawler + Phyrexian Altar + one other zombie in play = https://edhrec.com/combos/b/1304
  Add Orc Sureshot to this combo to weaken all of your opponents' creatures, dealing even with indestructible creatures

• Urborg, Tomb of Yawgmoth + Kormus Bell + Make Obsolete/Massacre Wurm/Gruesome Realization = https://edhrec.com/combos/b/3747
  WARNING: This is a potentially friendship-ending combo and can also destroy all of your own lands if you have a single global -1/-1 effect in play

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Archivist Notes

Perhaps it goes without saying, but this is not a “legal” Commander deck as your 3 "commanders" are not legally allowed to be in the Command Zone. But Sauron scoffs at your pitiful rules...

If you would prefer to keep things "legal" you could run Ayara as the commander, though you would need to be careful with the global -1/-1 effects. If you do chose this route, going for the combo win would likely be the way to go.

Either way, this deck can be quite oppressive and won't make you a lot of friends at the table, but who better to be the archenemy than Sauron?