1 Mana Crypt
1 Tolarian Academy
1 Show and Tell
1 Omniscience
1 Opalescence
1 Doubling Season
1 Cackling Counterpart
1 Radiate
1 Thousand-Year Storm
1 Biblioplex Assistant
1 Chef's Kiss
1 Balance of Power
1 Fathom Mage
1 Nykthos Paragon
1 Death's Oasis
1 Gorilla Shaman
1 Mirrorworks
1 Scrap Trawler
1 Bolt Bend
1 Voracious Greatshark
1 Mana Vault
1 Sleeper Dart
1 Rings of Brighthearth
1 Vedalken Orrery
1 Monkey Cage
1 Argentum Armor
1 Summoning Station
1 Possessed Portal
1 The Magic Mirror
1 Aladdin's Lamp
1 Rootwater Diver
1 Chainer, Nightmare Adept
1 Bloodbond March
1 Molten Echoes
1 Double Major
1 Magda, Brazen Outlaw
1 Rhys the Exiled
1 Mishra, Artificer Prodigy
1 Yarok, the Desecrated
1 Vorinclex, Monstrous Raider
1 Bounteous Kirin
1 Kamahl, Heart of Krosa
1 Myojin of Life's Web
1 Myojin of Infinite Rage
1 Iname as One
1 Draco
1 Goblin Welder
1 Battle Cry Goblin
1 Rousing Refrain
1 Douse
1 Circle of Dreams Druid
1 Worldsoul Colossus
1 King Crab
1 Spinal Villain
1 Southern Paladin
1 Western Paladin
1 Daretti, Ingenious Iconoclast
1 Elite Arcanist
1 Emergency Powers
1 Teferi, Temporal Archmage
60

An operation, defined as "multiplying the number of times you can do the prior step by some large number that is itself scaled well by the combo, with each iteration of the prior step more effective than the last" is the way I measured how effective the combo is; the combo performs 99 operations. During the explanation I'll put the number added by each part as well as the total in parenthesis.

To start, play Mana Crypt and Tolarian Academy, tap to cast Show and Tell and put in Omniscience. The draw method to set up is using Balance of Power, which draws up to 6 or 7 cards depending on whether the opponent put a land in with Show and Tell (barely matters either way), then copying it with Thousand-Year Storm and Chef's Kiss, but more on that later. The fundamental source of increases in the deck is Cackling Counterpart targeting a Doubling Season turned into a creature with Opalescence, which creates 2^(current number of Doubling Seasons) new copies (1). Radiate is used on Cackling Counterpart, creating a Cackling copy for each creature on the board, which scales with Doubling Seasons and hits all of them (+1, 2). Thousand-Year Storm is also copied by the Radiates, and copies each Radiate numerous times (+1, 3). Biblioplex Agent puts Cackling and Radiate back on top of the library and is produced by Radiates, so we are limited by draw. As mentioned, we use Balance of Power for draw, which is scaled by TYS (+1, 4) and can't draw itself after being put on top with the Biblioplex. We use Chef's Kiss to copy the Balance of Power, with the Kiss also copied by TYS (+1, 5) so each Balance of Power copy is in fact drawing a Chef's Kiss, which in turn draws Radiate and Cackling TYS*storm times.

To redraw BoPs, we convert colorless mana to life with the second ability of Death's Oasis, which is created by Radiate so we never run out. The lifegain then triggers each Nykthos Paragon [created since the last step, which is nearly all of them] (+1, 6), putting +1/+1 counters on each Fathom Mage (+1, 7) that also get exponentiated by our Doubling Seasons. Each +1/+1 counter creates a separate Fathom Mage trigger, each of which redraws BoP. Vedalken Orrery allows us to recast those BoPs between the triggers.

Generating colorless mana will primarily be done by Mana Crypt; to get it in the graveyard, we use Gorilla Shaman and I'll explain how to get it back to the hand shortly. When we recast Mana Crypt, it triggers all of our nonlegendary Mishras (created first by Double Major, then Radiate keeps the nonlegendary part) and is countered by Voracious Greatshark (later Radiate on the shark) so we can benefit from each Mishra (+1, 8). Every time it enters, it triggers our Mirrorworks and creates 2^Doubling Seasons copies, each of which can be tapped for Death's Oasis activations (+1, 9). But in fact, our nonlegendary Yaroks (same method as Mishra) will create that many copies of the Mirrorworks trigger, and each Mirrorworks trigger will create more copies than the last because we make more Doubling Seasons before they go off (+1,10). We use Gorilla Shaman to sacrifice Mana Crypt between Mishra triggers and at the end.

To return Mana Crypt, we play Mana Vault and destroy it with the Gorilla Shaman. This triggers each of our Scrap Trawlers; normally, only one Trawler would return the Crypt and the rest would fizzle, but by recasting Bolt Bend, we can make each Trawler trigger hit the Crypt by returning it to the graveyard between them (+1, 11). As Scrap Trawler triggers on token artifacts as well, Mishra, Mirrorworks, Doubling Season, and Yarok all increase the number of times we can sacrifice Vaults (+3, 14). Incidentally, Mana Vault was chosen primarily for being a 1-cost artifact, with the tap ability being only a tiebreaker that makes it a little cheaper to sac than the others. For the same reason, we use Sleeper's Dart as our 2-cost artifact; as Scrap Trawler returns an artifact of lower cmc, this allows us to return Mana Vaults scaled once again on Mishra, Mirrorworks, Doubling Season, Yarok, and Scrap Trawlers (+4, 18). We then use Rings of Brighthearth (not a useful ability yet, but it will be so later) as our 3-cost artifact (+4, 22) and Vedalken Orrery (already mentioned, very useful) as our 4-cost (+4, 26). We use Monkey Cage (cheap sac as tiebreaker) for our 5-cost (+4, 30) and Argentum Armor (useful later). (+8, 38). Above this our choices get pretty slim; 7 is Summoning Station, a very minor tiebreaker (+4,42). For 8 and 9 Possessed Portal and The Magic Mirror are the only options that don't go infinite. Since all Possessed Portals must be sacced before we can spend our colorless mana and Magic Mirror copies exit the board simultaneously from the legend rule, we can't increase the number of Scrap Trawlers between each Doubling Season-created copy, so they're only +3s each (+6, 44). For 10 cmc we use Aladdin's Lamp, an artifact with a blessedly useless effect (+4, 48).

Our Scrap Trawler Chain can't go higher, so to return the Lamp we use Rootwater Diver. Using the Greatshark from before and Bloodbond March as a creature-Mishra, we can have it enter the battlefield multiple times (+1, 49), given haste each time by Chainer so it can remove itself in between. We also use Molten Echoes, naming whichever creature type with a tap ability will make use of it next (usually Merfolk) which works like Mirrorworks, scaling with Doubling Season and Yarok (+2, 51). We use Rings of Brighthearth as another multiplier (+1, 52) by leaving the last possible batch on the board, letting them all trigger when the Diver is activated, then destroying them for profit before any of the Diver triggers resolve, and redirecting later triggers with Bolt Bend.

To return the Diver, we use Death's Oasis and Magda. Using Shark and Bloodbond, Magda enters the battlefield multiple times (+1, 53), each of which triggers a single Molten Echoes naming Dwarf, killing the original Magda via the legend rule and triggering all of our Death's Oases (+1, 54). The Oasis works a lot like Scrap Trawler for creatures, but only triggers on nontoken creature deaths, so it doesn't scale with Molten Echoes/Mirrorworks + Doubling Season like Trawler does, so we can only get +2 out of each creature cost. Still, we use Rhys the Exiled (useful later, like Magda) for our 3-cost (+2, 46), Mishra and Yarok (already mentioned) for 4 and 5 (+4, 50) and Vorinclex and Bounteous Kirin (useful only as tiebreakers) for 6 and 7 (+4, 54). Kamahl, useful later, is our 8-cost (+4, 58) and after that the selection is slim enough that triggering Kirin is the best we can do, so we use textless Myojins and Iname for 9, 10, and 12 (+12, 70). We can't use the only 11 and 15 cost legendaries, Ulamog and Emrakul, because their last abilities would make them go infinite easily; we also can't use the 13 cost Emrakul because it could be recast with Chainer. Instead, we top the chain with Draco. Draco won't be limited by our ability to recast it, as we can use Chainer, but by our ability to kill it, so it only scales with Death's Oasis (+1, 71).

To kill Draco we use Goblin Welder, whose ability can be copied with the Rings (+1, 72). To reuse Goblin Welder we use Battle Cry Goblin's first ability, which is Rings-copiable (+1, 73) and affects every Welder, even the Radiate-made copies (+1, 74). To get red mana for BC Goblin we use Rousing Refrain, which is copied by TYS (+1, 75). To prevent Refrain from exiling itself and becoming unusable, we counter the original with Douse. We generate blue mana for Douse by activating Kamahl (Rings-scalable with Bolt Bend) (+1, 76) on Tolarian Academy. When it becomes a creature it can be copied with a Radiated Counterpart, but the copies won't be creatures and the legend rule will kill all but 1 before they can tap; we use that to keep a single new, token, untapped Academy and remove the original. Academy then taps for blue based on the number of Biblioplex Agents, Scrap Trawlers, and Dracos we have (+1, 77). Green mana for Kamahl is made by Circle of Dreams Druid, whose ability scales on the number of creatures on the board (+1, 78) and Molten Echoes and Doubling Season (+2, 80). We sacrifice it with Rhys.

To get black mana we convoke Worldsoul Colossus, tapping two Oases to pay for the green and white and all of our Magdas to pay for a very large X. Each Magda will trigger (+1, 81) and the Treasure tokens created are exponentiated by Doubling Seasons (+1, 82). Worldsoul Colossus is removed from the board to reuse with King Crab, who scales with Molten Echoes, Doubling Season, and Rings (+3, 85). King Crab is removed from the board to re-trigger Molten Echoes by using Spinal Villain, which also scales with Echoes, DS, and Rings (+3, 88). It can be returned by a single Death's Oasis trigger, a trivial cost at this point. The Villain is removed by Southern Paladin in the same way (+3, 91), and the Southern Paladin by the Western one (+3, 94).

Western Paladin is removed by Daretti's second ability, which scales with Rings when aided by Bolt Bend (+1, 95). Daretti can be removed by the Southern Paladin, but can't be easily returned since it isn't an artifact or creature. We use Emergency Powers for that. It exiles itself and can't be countered with Douse, so instead of casting it normally we exile it on an Elite Arcanist with haste from Molten Echoes. The Arcanist's ability can be copied with Rings (+1, 97) and casts the copy, triggering TYS (+1, 98), but the spell can never be used by another Arcanist, so removing and replaying it wouldn't help.

Instead, we use Teferi to untap it. Teferi's ultimate is also necessary to allow us to use Daretti's ability in between each Emergency Powers copy; fortunately, we can get a free usage of it by playing him early in the game, with 1 Doubling Season on the board, so he kills himself by using his ultimate and can be returned by our first Emergency Powers. But now, we're using his -1 ability on the Arcanist, multiplied by Rings (+1, 98).

Finally, it's time to enter the combat step. First, we leave the Arcanist untapped and the last possible batch of Argentum Armors on the board and equipped to something that can attack. We swing with all of our creatures that have haste, which is all of our Vorinclexes, one Molten Echoes copies of each of our legendaries, and any Molten Echoes copies of stuff without a tap ability like Draco or BC Goblin that we have lying around. But before they hit, each Argentum Armor will trigger, after which we can them all. We point them all at Teferi, removing him so he can be reused by the Emergency Powers on the Arcanist an additional time, with Bolt Bend allowing each Armor to do its thing (+1, 99). We can't declare an attack with anything made after this point, but that's not a big deal since Magda's first ability on all her nonlegendary copies means our one attacking copy of her will always strike with a power based on the number of creatures created in the most recent step (plus all the Nykthos Paragon triggers we befriended along the way).