This deck aims to recreate the functionality of the card shaharazad using completely legal cards in commander
step 1: mulligan into one of several tutors, and use one or more to find Enter the Infinite.
step 2: cast enter the infinite on turn 12, and then pass the turn. On turn 13 play Reliquary Tower.
step 3: generate infinite mana using Isochron Scepter, Dramatic Reversal, and Gilded Lotus. Then copy Isochron Scepter using Sculpting Steel, and imprint Narset's Reversal. Now we have infinite mana, and can bounce and recast any spell infinitely. Then cast Vedalken Orrery and Silence.
step 4: cast Kenrith, the Returned King, and activate his ability to give all creatures haste, and then cast Tree of Perdition. Copy tree of perdition once for each opponent using Stolen Identity, and sculpting steel. Then activate each tree to 'save' each player's life totals.
step 5: gain control of all permanents using Agent of Treachery and Rescue. Then cast and rescue Suncleanser once for each player to remove all counters.
step 6: activate kenriths ability to draw a card 7 times for each player and hold priority. Then while the draws are still on the stack, cast the following in order: Worldfire, Teferi's Protection, Reminisce, One with Nothing, Nexus of Fate. (make sure to use copies for this step, so we can keep all these spells in hand and they can be saved from worldfire).
we discard our hand, shuffle it into our library, exile all hands, boards and graveyards, and then we get an extra turn.
step 7: pass the turn, and when you phase back in, draw your whole deck using kenrith. Recast Silence, then cast Hive Mind and Oketra's Last Mercy to restore each player to starting life. And then cast Oblivion Ring targeting hive mind.
step 8: cast Disciple of Caelus Nin, and choose the following, Isochron Scepter, gilded lotus, sculpting steel, reliquary tower and kenrith. then cast Abyssal Persecutor to stop anyone losing the game during the subgame, then play Solitary Confinement to stop ourselves from decking.
setup is complete. Each player has their starting life totals, a clean board and graveyard, a fresh hand, and no counters. in addition, no players can lose, all permanents from before the subgame are phased out until we say otherwise, and we can't take damage.
step 9: when the subgame is about to end by lethal damage or another way, cast 3 copies of Nexus of Fate, on the first extra turn, rescue the desciple of nin and solitary confinement, and then pass. On our second turn, when we phase back in, cast the following in order, worldfire, teferis protection, reminisce, and one with nothing.
we discard our hand, shuffle it into our library, all our permanents phase out, and then all the subgame permanents hands and graveyards are exiled.
step 10: on extra turn number 3, after we phase back in, draw your entire library with kenrith.
step 11: return all the cards used during the subgame to their owners graveyards using Pull from Eternity and narsets reversal. Then cast Reminisce once for each player. Their decks have been restored to their pre subgame state.
step 12: pull from eternity each player's pre subgame hands, then rescue Oblivion Ring and cast Regrowth a number of times equal to the greatest hand size, then rescue hivemind (opponents have no targets) and pull from eternity all presubgame graveyards.
step 13: tap the tree that stores the 'losing' players life total, and then kick Scourge of the Skyclaves. Then restore each other opponents life total using the trees.
step 14: return each player's permanents using Harmless Offering, each player's board has been restored.
step 15: cast Ichor Rats to give each player a poison counter, then use either contagion clasp to give players more poison (up to their pre subgame amount), or Suncleanser to remove poison from those who didn't have any.
each player's boards, hands, graveyards, and life totals have been restored, the losers life has been halved, all counters acquired during the subgame have been removed, and poison has been restored.
And there we go! that is the deck so far (the version I own anyways) there are a few cards that could be added below that would make a more complete subgame by resetting more kinds of counters and making us a little more survivable, I may add these to the main list later depending on if I can get ahold of them :). I tried to keep the deck relatively affordable, some spells are just so unique they have no replacements, such as enter the infinite or teferis protection, and these do drive up the price a bit unfortunately. I think this version provides a reasonably complete subgame experience to replace the banned card Shahrazad, but for about a hundred times the mana and a hundred times the cards!
Limitations: Emblems are impossible to get rid of, as is the cities blessing and similar effects unfortunately, there is currently no way to solve these issues.
Maybeboard: Eomer, King of Rohan can essentially be used to reset the monarch, make yourself the monarch when he enters, and then bounce and recast after the subgame to reset the monarch to whoever it's supposed to be. Void Attendant can be used to return both face up and face down cards from exile without using narsets reversal! Ezuri, Claw of Progress and Glint-Sleeve Siphoner can be exiled using Fractured Identity to give each opponent an experience counter and an energy, they can then be proliferated to the correct ammount, or removed using Price of Betrayal
post post script enter the infinite, the blue tutors, and the islands can be subbed for black tutors, swamps and insidious dreams. find insidious dreams, discard 3 grabbing Isochron Scepter, gilded lotus and dramatic reversal. use these cards to generate infinite coloured mana, cast Kenrith and draw your library that way. This should speed the deck up from turn 13 to around turn 7 or 8