Time Sieve + Myr Battlesphere + Teleportation Circle + Thopter Spy Network

Time Sieve

Myr Battlesphere

Teleportation Circle

Thopter Spy Network

How it works

1. At the beginning of your upkeep, Thopter Spy Network's first ability triggers, creating a 1/1 Thopter artifact creature 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, sacrificing the Thopter and the four Myrs, causing you to take an extra turn after this one.
5. Repeat each turn.

This clever engine uses Teleportation Circle to continuously blink Myr Battlesphere at the end of every turn, generating a fresh crop of four Myr tokens each time. Meanwhile, Thopter Spy Network reliably sets up the board during your upkeep by supplying an initial Thopter token to feed the ritual. By combining these bodies with Time Sieve, you have exactly the five artifact sacrifices needed on each loop to seize infinite extra turns and lock your opponents out of the game entirely.