Time Sieve + Myr Battlesphere + Teleportation Circle + Doomed Artisan

Time Sieve

Myr Battlesphere

Teleportation Circle

Doomed Artisan

How it works

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

This clever loop lets you harvest infinite extra turns by recycling your board state every single round. It all kicks off during your end step, where Teleportation Circle blinks Myr Battlesphere to flood your battlefield with four brand new Myr artifact creature tokens. Meanwhile, Doomed Artisan steadily grows your artifact count by churning out a fresh Sculpture token each turn. Once you've gathered enough pieces, you simply tap Time Sieve and feed it the newly minted Sculptures and Myrs as sacrifices to chain endless extra turns together.