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, Don & Leo 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 turns

Lock

Infinite Guideline Station

Time Sieve

Don & Leo, Problem Solvers

Activate Niko by paying {2} and tapping it, exiling Timestream Navigator and causing Shards you control to become a copy of Timestream Navigator until the end step.
Activate a Shard by paying {2}{U}{U}, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
At the beginning of the next end step, Timestream Navigator is returned from exile to the battlefield. Don & Leo then triggers, blinking Niko.
When Niko enters, it triggers, creating two Shard tokens.
Repeat each turn.

Niko, Light of Hope

Timestream Navigator

Activate Spark Double 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, Don & Leo triggers, blinking Spark Double. Choose to have it enter the battlefield as a copy of Avatar Kuruk.
Repeat each turn.

The Legend of Kuruk // Avatar Kuruk

Spark Double

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, Don & Leo 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.

Barbara Wright

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, Don & Leo triggers, blinking Marvin.
Repeat each turn.

Marvin, Murderous Mimic

Cast Exchange of Words by paying {1}{U}{U}.
When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of it and Wormfang Manta.
At the beginning of your end step, Don & Leo triggers, blinking Exchange of Words.
Exchange of Words leaves and enters the battlefield, triggering the second ability it gained from Wormfang Manta's textbox as well as its own ability.
Resolve the first Exchange of Words trigger, causing you to take an extra turn after this one.
Resolve the second Exchange of Words trigger, exchanging the text boxes of it and Wormfang Manta.
Repeat from step 3 during each turn.

Exchange of Words

Opalescence

Wormfang Manta

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, Don & Leo 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

Starfield of Nyx

Cast Walk the Aeons for its buyback cost by paying {4}{U}{U} and sacrificing three Islands, causing you to take an extra turn after this one and return Walk the Aeons to your hand.
Blink Lumra using Don & Leo.
When Lumra enters, it triggers, causing you to mill four cards and then return all land cards from your graveyard to the battlefield tapped.
Repeat each turn.

Near-infinite extra turns

Lumra, Bellow of the Woods

Walk the Aeons

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, Don & Leo 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

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, Don & Leo 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

Declare The Golden-Gear Colossus as an attacker. It triggers, creating two 1/1 Gnome artifact creature tokens and 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, Don & Leo triggers, blinking Ultimecia, Omnipotent. It'll enter the battlefield as Ultimecia, Time Sorceress.
When Ultimecia, Time Sorceress enters, it triggers, causing you to surveil 2.
Repeat each turn.

Ultimecia, Time Sorceress // Ultimecia, Omnipotent

Tetzin, Gnome Champion // The Golden-Gear Colossus

Mycosynth Lattice

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, Don & Leo 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.

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, Don & Leo 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.

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