Activate Sakashima of a Thousand Faces using Avatar Kuruk's ability by paying {20} minus {1} for each creature and/or artifact you can tap while activating it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Sakashima of a Thousand Faces. Choose to have it enter the battlefield as a copy of Avatar Kuruk.
Repeat each turn.

Infinite turns

The Legend of Kuruk // Avatar Kuruk

Airbender Ascension

Sakashima of a Thousand Faces

Activate Avatar Kuruk by paying {20} minus {1} for each creature and/or artifact you can tap while activating it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Avatar Kuruk and causing it to return to the battlefield as The Legend of Kuruk with two lore counters on it due to Doubling Season.
The Legend of Kuruk's first and second chapter abilities trigger, causing you to scry 2, draw a card, scry 2 and draw another card.
Move to your next turn. At the beginning of your precombat main phase. The Legend of Kuruk triggers, putting two lore counters on it. Its third chapter ability triggers, causing you to exile it and return it to the battlefield as Avatar Kuruk.
Repeat.

Doubling Season

Activate Avatar Kuruk by paying {20} minus {1} for each creature and/or artifact you can tap while activating it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Avatar Kuruk and causing it to return to the battlefield as The Legend of Kuruk. Choose to have it enter with three lore counters due to its read-ahead ability given to it by Barbara Wright.
The Legend of Kuruk's third chapter ability triggers, causing you to exile it and return it to the battlefield as Avatar Kuruk.
Repeat each turn

Barbara Wright

Cast Infinite Guideline Station either from your hand or from the command zone by paying {W}{U}{B}{R}{G} plus commander tax if applicable.
When Infinite Guideline Station enters, it triggers, creating a 2/2 Robot artifact creature token for each multicolored permanent you control.
Activate Infinite Guideline Station's station ability by tapping any number of creatures with total power 12 or greater, putting at least twelve charge counters on Infinite Guideline Station, causing it to become a creature.
Activate Time Sieve by tapping it and sacrificing five Robots, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Infinite Guideline Station.
When Infinite Guideline Station enters, it triggers, creating a 2/2 Robot artifact creature token for each multicolored permanent you control.
Repeat from step 3 each turn.

Infinite Guideline Station

Time Sieve

Activate Avatar Kuruk by paying {20} minus {1} for each creature and/or artifact you can tap while activating it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Avatar Kuruk and causing it to return to the battlefield as The Legend of Kuruk with a lore counter on it.
The Legend of Kuruk's first chapter ability triggers, causing you to scry 2 and draw a card.
Move to your next turn. At the beginning of your precombat main phase. The Legend of Kuruk triggers, putting a lore counter on it. Its second chapter ability then triggers, causing you to scry 2 and draw a card.
Activate Lulu by paying {3}{U}, causing you to proliferate and put a lore counter on The Legend of Kuruk.
The Legend of Kuruk's third chapter ability triggers, causing you to exile it and return it to the battlefield as Avatar Kuruk.
Repeat.

Lulu, Stern Guardian

Activate Marvin using Avatar Kuruk's ability by paying {20} minus {1} for each creature and/or artifact you can tap while activating it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Marvin.
Repeat each turn.

Marvin, Murderous Mimic

Cast Illusion of Choice by paying {U}, allowing you to decide how each player votes this turn and causing you to draw a a card.
Cast Plea for Power by paying {3}{U}, choosing all votes to be for time, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Illusion of Choice and Plea for Power from your graveyard to your hand.
Repeat each turn.

Plea for Power

Illusion of Choice

Scholar of the Ages

Activate Timestream Navigator by paying {2}{U}{U}, tapping and putting it on the bottom of your library, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Forerunner of the Coalition.
Forerunner of the Coalition enters, triggering its first ability, causing you to search your library for Timestream Navigator and put it on top of your library.
Move to your next turn, drawing Timestream Navigator during your draw phase.
Cast Timestream Navigator by paying {1}{U}.
Timestream Navigator enters the battlefield, triggering Forerunner of the Coalition's second ability, causing each opponent to lose 1 life.
Repeat.

Forerunner of the Coalition

Timestream Navigator

Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
Activate Coretapper's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter.
Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Sharuum.
When Sharuum enters the battlefield, it triggers, returning Coretapper from your graveyard to the battlefield.
Repeat each turn.

Sharuum the Hegemon

Coretapper

Magistrate's Scepter

At the beginning of your upkeep, Panoptic Mirror triggers, casting a copy of Moonmist without paying its mana cost.
Resolve Moonmist, transforming Ultimecia, Time Sorceress into Ultimecia, Omnipotent.
Ultimecia, Omnipotent triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Ultimecia, Omnipotent and causing it to re-enter the battlefield as Ultimecia, Time Sorceress.
Whenever Ultimecia, Time Sorceress enters the battlefield, it triggers, causing you to surveil 2.
Repeat each turn.

Ultimecia, Time Sorceress // Ultimecia, Omnipotent

Moonmist

Panoptic Mirror

Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Moonmist without paying its mana cost.
Resolve Moonmist, transforming Ultimecia, Time Sorceress into Ultimecia, Omnipotent.
Ultimecia, Omnipotent triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Airbender Ascension triggers, blinking Ultimecia, Omnipotent and causing it to re-enter the battlefield as Ultimecia, Time Sorceress.
Whenever Ultimecia, Time Sorceress enters the battlefield, it triggers, causing you to surveil 2.
Repeat each turn.

Combos with "Airbender Ascension"