Cast Time Warp by paying {3}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Eternal Witness until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Eternal Witness from exile to the battlefield.
Eternal Witness enters the battlefield, putting Time Warp into your hand from your graveyard.
Repeat each turn.

Infinite turns

Lock

Roon of the Hidden Realm

Eternal Witness

Time Warp

Cast Time Warp by paying {3}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Archaeomancer until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Archaeomancer from exile to the battlefield.
Archaeomancer enters the battlefield, putting Time Warp into your hand from your graveyard.
Repeat each turn.

Archaeomancer

Cast Temporal Manipulation by paying {3}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Eternal Witness until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Eternal Witness from exile to the battlefield.
Eternal Witness enters the battlefield, putting Temporal Manipulation into your hand from your graveyard.
Repeat each turn.

Temporal Manipulation

Cast Temporal Manipulation by paying {3}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Archaeomancer until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Archaeomancer from exile to the battlefield.
Archaeomancer enters the battlefield, putting Temporal Manipulation into your hand from your graveyard.
Repeat each turn.

Cast Walk the Aeons by paying {4}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Eternal Witness until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Eternal Witness from exile to the battlefield.
Eternal Witness enters the battlefield, putting Walk the Aeons into your hand from your graveyard.
Repeat each turn.

Walk the Aeons

Cast Walk the Aeons by paying {4}{U}{U}, causing you to take an extra turn after this one.
Activate Roon by paying {2} and tapping it, exiling Archaeomancer until the beginning of your end step.
At the beginning of your end step, Roon triggers, returning Archaeomancer from exile to the battlefield.
Archaeomancer enters the battlefield, putting Walk the Aeons into your hand from your graveyard.
Repeat each turn.

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 Roon of the Hidden Realm.
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.

Combos with "Roon of the Hidden Realm"