B/G Jarad, Golgari Lich Lord 's Combo Toolbox feat. Necrotic Ooze (EDH / Commander)

Jarad, Golgari Lich Lord Combo, with Gitfrog, T&Gfrog, Old Stickle and Mycotyrant as lower power substitutes.

Win as soon as T2 (Sol Ring, Buried Alive, Reanimate) via Necrotic Ooze Combo, but all the other combos are viable as well:

Necrotic Ooze in play, Phyrexian Devourer and Triskelion in gy = Win
Necrotic Ooze and Jarad in play, Phyrexian Devourer in gy = Win
Necrotic Ooze and Altar of Dementia in play, Phyrexian Devourer in gy = Mill at least one Oppo
Necrotic Ooze and Lord of Extinction in play, Jarad in gy = Win
Necrotic Ooze and Phyrexian Devourer in play, Jarad in gy= Win
Necrotic Ooze and Mikaeus, the Unhallowed and Viscera Seer in play, Triskelion in gy = Win
Necrotic Ooze and Mikaeus, the Unhallowed and Altar of Dementia in play, Triskelion in gy = Win
Necrotic Ooze and Mikaeus, the Unhallowed and Phyrexian Altar in play, Triskelion in gy = Win

Jarad and Lord of Extinction in play, best after using Hermit Druid = Win
Jarad and Phyrexian Devourer in play = Win
Phyrexian Devourer and Altar of Dementia in play = Win against few opponents (might need you to endurance yourself first)

Mikaeus, the Unhallowed and Triskelion in play = Win
Mikaeus, the Unhallowed, Puppeteer Clique and Altar of Dementia in play = Win
Mikaeus, the Unhallowed, Puppeteer Clique and Viscera Seer = GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes, also get the top card of your lib to the missing combo piece
Mikaeus, the Unhallowed, Puppeteer Clique and Phyrexian Altar in play = Infinite Mana, GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes
Mikaeus, the Unhallowed, Woodfall Primus and Altar of Dementia in play = Win (You have to target your Altar at some point. In Response, sac Woodfall and repeat until you win. Then Altar gets destroyed)
Mikaeus, the Unhallowed, Woodfall Primus and Viscera Seer in play = Destroy all oppo lands and noncreatures.
Mikaeus, the Unhallowed, Woodfall Primus and Phyrexian Altar in play = Destroy all oppo lands and noncreatures and get big mana

Mazirek Kraul Death Priest, Puppeteer Clique and Altar of Dementia in play = Win
Mazirek Kraul Death Priest, Puppeteer Clique and Viscera Seer in play = GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes, also get the top card of your lib to the missing combo piece. Also all your creatures get +x/+x.
Mazirek Kraul Death Priest, Puppeteer Clique and Phyrexian Altar in play = Infinite Mana, GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes. Also all your creatures get +x/+x.
Mazirek Kraul Death Priest, Woodfall Primus and Altar of Dementia in play = Win
Mazirek Kraul Death Priest, Woodfall Primus and Viscera Seer in play = Destroy all oppo lands and noncreatures. Also all your creatures get +x/+x.
Mazirek Kraul Death Priest, Woodfall Primus and Phyrexian Altar in play = Destroy all oppo lands and noncreatures. Get big mana. Also all your creatures get +x/+x.

Melira, Sylvok Outcast, Puppeteer Clique and Altar of Dementia in play = Win
Melira, Sylvok Outcast, Puppeteer Clique and Viscera Seer in play = GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes. Also get the top card of your lib to the missing combo piece.
Melira, Sylvok Outcast, Puppeteer Clique and Phyrexian Altar in play = Infinite Mana, GetAllCreaturesFromAllOppoGYWithHasteInfiniteTimes.
Melira, Sylvok Outcast, Woodfall Primus and Altar of Dementia in play = Win
Melira, Sylvok Outcast, Woodfall Primus and Viscera Seer in play = Destroy all oppo lands and noncreatures.
Melira, Sylvok Outcast, Woodfall Primus and Phyrexian Altar in play = Destroy all oppo lands and noncreatures. Get big mana.

Mikaeus, the unhallowed, a sac outlet and either Junji, the Midnight Sky or Phyrexian Delver in play and the other one in the gy = Reanimate a bunch and let all opponents discard their hands

Living Death with Phyrexian Altar and enough creatures in play, Eternal Witness in gy/play = Probably a Win with infinite mana and recursion

Jarad in play also turns all Mazirek Combos into Wins. Also all Combos with Infinite Mana and Puppeteer Clique are wins with Jarad. Living Death Combo can also win via Jarad bringing him to have 9 viable Combos (With Devourer once, with Lord of Extinction once and once with Necrotic ooze while devourer is in the yard. 3times with MazirekCombo, 3times via infinite manaCombo + clique and once more with living death and infinite mana. It also enables the Necrotic Ooze + Devourer in play combo, when Jarad is in the yard)

There should be somewhat around 25 combinations of cards to basically combo off. Most of them only need 2 or 3 cards and quite few other requirements, with necrotic ooze being the star and mikaeus+tris being a close second. Both combos can be easily obtained via buried alive + some reanimation spell, defense of the heart trigger or entwined Tooth & Nail.
Rest of the deck is toolboxish removal, tutoring, ramp and good stuff. There are multiple sac outlets in Viscera Seer , Altar of Dementia , Phyrexian Altar and Greater Good, with Phyrexian Tower and Birthing Pod at least giving one sac per turn. Yeah, it's also a Pod deck. The 4 cmc spot needs a few more drops depending on the deck configuration (what cmdr is played).

The lands subtheme gets build upon in the gitrog iteration and also features a unique "combo" with Underrealm Lich and The Gitrog Monster in play. Life from the loam coupled with strip mine while having gitfrog and/or Oracle of mul daya out can also close out games early.

The T&G iteration features Elesh Norn, Grand Cenobite + Kormus Bell + Urborg, Tomb of Yawgmoth Combo for total control over opponents lands. Includes one basic plains.

Old Stickfingers needs a lot of retuning and performs best with an edh deck that doesn't play more than 5 creatures to make sure it mills Necrotic Ooze or Mikaeus Combo on Cast.

Mycotyrant is great with Hermit Druid and Mycoloth.

Future Notes:

We need 2 more Fetchlands, Ancient Tomb, Nurturing Peatland, Mana Vault, Mana Crypt, Vampiric Tutor (etc), Sylvan Library, Endurance and Veil of Summer to get competitive. Evolving Wilds, Restless Cottage, Emergence Zone, Tranquil Thicket go out for the lands. Mausoleum Secrets out for Vampiric Tutor, Endurance and Veil of Summer replace Nyx Weaver and Stinkweed Imp. Mana Vault and Crypt come in for Cultivate and Scavenging Ooze.
Cabal Coffers(Instead of Crypt of Agadeem), Gaea's Cradle(Instead of Golgari Rot Farm), a dual land(cut basic forest) and survival of the fittest(Cut Fauna Shaman) would also work very well, but are also way too pricey.