Time Sieve + Myr Battlesphere + Teleportation Circle + Tamiyo's Journal

Time Sieve

Myr Battlesphere

Teleportation Circle

Tamiyo's Journal

How it works

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

This elegant loop turns your end step and upkeep into a continuous engine for infinite turns, sustained entirely by the manufacturing power of Myr Battlesphere. As Teleportation Circle blinks the Battlesphere every end step, it fresh-supplies the battlefield with four brand-new Myr artifact creature tokens. Meanwhile, Tamiyo's Journal dutifully investigates at the beginning of each upkeep to hand you an extra Clue token, which nicely rounds out the artifact count. With five artifacts gathered—your freshly minted Clue and four loyal Myrs—you simply tap Time Sieve and sacrifice them all to claim another turn, repeating this clockwork sequence indefinitely.