During your upkeep, Extravagant Replication triggers, creating a token copy of Timestream Navigator.
During your next upkeep, Extravagant Replication triggers, creating a token copy of Timestream Navigator.
Activate the ability of a Timestream Navigator token that did not enter the battlefield this turn by paying {2}{U}{U}, tapping it, and putting it on the bottom of your library, taking an extra turn.
Repeat from 2.

Infinite turns

Timestream Navigator

Extravagant Replication

Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Archaeomancer.
When the Archaeomancer token enters the battlefield, it triggers, returning Time Warp from your graveyard to your hand.
Repeat.

Archaeomancer

Time Warp

At the beginning of your upkeep, Extravagant Replication triggers, creating two token copies of Three Blind Mice.
The Three Blind Mice tokens enter the battlefield with two lore counters on them due to Doubling Season, triggering their first and second chapter abilities.
Resolve the first Three Blind Mice triggers, creating four 1/1 Mouse creature tokens.
Resolve the next Three Blind Mice trigger, creating two token copies of a Three Blind Mice token.
Repeat from step 2.
Once you have infinite Three Blind Mice triggers, you may use them to copy any token(s) you control.

Infinite copies of tokens you control

Infinite creature tokens

Infinite ETB

Infinite Three Blind Mice tokens

Three Blind Mice

Doubling Season

At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Myr Battlesphere.
The Myr Battlesphere token enters the battlefield, creating four 1/1 Myr creature tokens.
Activate Time Sieve by tapping it, sacrificing the Myr Battlesphere token and sacrificing the four Myr tokens, causing you to take an extra turn after this one.
Repeat each turn.

Time Sieve

Myr Battlesphere

At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Three Blind Mice.
The Three Blind Mice token enters the battlefield with two lore counters on it due to Vorinclex, triggering its first and second chapter abilities.
Resolve the first Three Blind Mice trigger, creating a 1/1 Mouse creature token.
Resolve the next Three Blind Mice trigger, creating a token copy of the Three Blind Mice token.
Repeat from step 2.

Vorinclex, Monstrous Raider

At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule, causing you to take an extra turn after this one.
Repeat each turn.

Ugin's Nexus

Tamiyo's Compleation

At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Academy Manufactor.
When the Academy Manufactor token enters the battlefield, Tezzeret triggers, putting a loyalty counter on it.
Activate Transmutation Font by tapping it, creating three Food, Clue and Treasure tokens.
When the tokens enter the battlefield, Tezzeret triggers nine times, putting nine loyalty counters on it.
Activate Tezzeret using the ability granted to it by Ichormoon Gauntlet by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Academy Manufactor.
When the Academy Manufactor token enters the battlefield, Tezzeret triggers, putting a loyalty counter on it.
Activate Transmutation Font by tapping it, creating nine Food, Clue and Treasure tokens.
When the tokens enter the battlefield, Tezzeret triggers 27 times, putting 27 loyalty counters on it.
Activate Tezzeret using the ability granted to it by Ichormoon Gauntlet by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat from step 9 each turn.

Near-infinite colored mana

Near-infinite Treasure tokens

Near-infinite Clue tokens

Near-infinite Food tokens

Tezzeret, Cruel Captain

Ichormoon Gauntlet

Academy Manufactor

Transmutation Font

At the beginning of your upkeep, Extravagant Replication and Tamiyo's Journal trigger.
Resolve the Extravagant Replication trigger, creating a token copy of Academy Manufactor.
When the Academy Manufactor token enters the battlefield, Tezzeret triggers, putting a loyalty counter on it.
Resolve the Tamiyo's Journal trigger, creating three Clue, Food and Treasure tokens.
When the tokens enter the battlefield, Tezzeret triggers nine times, putting nine loyalty counters on it.
Activate Tezzeret using the ability granted to it by Ichormoon Gauntlet by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Extravagant Replication and Tamiyo's Journal trigger.
Resolve the Extravagant Replication trigger, creating a token copy of Academy Manufactor.
When the Academy Manufactor token enters the battlefield, Tezzeret triggers, putting a loyalty counter on it.
Resolve the Tamiyo's Journal trigger, creating nine Clue, Food and Treasure tokens.
When the tokens enter the battlefield, Tezzeret triggers 27 times, putting 27 loyalty counters on it.
Activate Tezzeret using the ability granted to it by Ichormoon Gauntlet by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat from step 8 each turn.

Combos with "Extravagant Replication"