Blink Wormfang Manta using Abuelo. Wormfang Manta's first ability won't trigger due to Doorkeeper Thrull.
Wormfang Manta's second ability triggers, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Lock

Wormfang Manta

Abuelo, Ancestral Echo

Doorkeeper Thrull

Activate Timestream Navigator 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.
Blink Recruiter of the Guard using Abuelo.
When Recruiter of the Guard enters, it triggers, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Timestream Navigator

Recruiter of the Guard

Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
At the beginning of your end step, Abuelo triggers, returning Ugin's Nexus from exile to the battlefield.
When Ugin's Nexus enters the battlefield, Replication Specialist triggers, causing you to pay {1}{U} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
Move to your next turn, not skipping it as Ugin's Nexus is not on the battlefield.
Repeat from step 2.

Ugin's Nexus

Replication Specialist

Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
At the beginning of your end step, Abuelo triggers, returning Ugin's Nexus from exile to the battlefield.
When Ugin's Nexus enters the battlefield, Mirrorworks triggers, causing you to pay {2} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
Move to your next turn, not skipping it as Ugin's Nexus is not on the battlefield.
Repeat from step 2.

Mirrorworks

Deal combat damage using Medomai, triggering its ability, causing you to take an extra turn after this one.
Cast The Wondrous Wasp by paying {1}{U}.
When The Wondrous Wasp enters, it triggers, tapping Medomai and causing it to lose all its abilities until The Wondrous Wasp leaves the battlefield.
Move to your next turn.
Declare Medomai as an attacker.
Holding priority, activate Abuelo by paying {1}{W}{U}, exiling The Wondrous Wasp until your end step. This will also cause Medomai to regain its abilities.
Deal combat damage using Medomai, triggering its ability, causing you to take an extra turn after this one.
At the beginning of your end step, Abuelo triggers, returning The Wondrous Wasp from exile to the battlefield.
Repeat from step 3.

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