At the beginning of your end step, Doomed Artisan triggers, creating a copy of Timestream Navigator.
Activate the oldest Timestream Navigator, paying {2}{U}{U} and putting Timestream Navigator on the bottom of your library to take an extra turn after this one.
Pass the turn.
Repeat.

Infinite turns

Esix, Fractal Bloom

Timestream Navigator

Doomed Artisan

At the beginning of your end step, Teleportation Circle and Doomed Artisan trigger.
Resolve the Doomed Artisan trigger, creating a X/X Sculpture artifact creature token.
Resolve the Teleportation Circle trigger, blinking Myr Battlesphere.
When Myr Battlesphere enters the battlefield, its first ability triggers, creating four 1/1 Myr artifact creature tokens.
Activate Time Sieve by tapping it and sacrificing the Sculpture and Myrs, causing you to take an extra turn after this one.
Repeat each turn.

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