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 Phelia.
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.

Infinite turns

Lock

Timestream Navigator

Recruiter of the Guard

Phelia, Exuberant Shepherd

Blink Wormfang Manta using Phelia. 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.

Wormfang Manta

Doorkeeper Thrull

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 and Phelia as attackers.
Phelia triggers, 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, Phelia triggers, returning The Wondrous Wasp from exile to the battlefield.
Repeat from step 3.

Combos with "Phelia, Exuberant Shepherd"