Time Sieve + Myr Battlesphere + Soulherder + Elesh Norn, Mother of Machines

Time Sieve

Myr Battlesphere

Soulherder

Elesh Norn, Mother of Machines

How it works

1. At the beginning of your end step, Soulherder's second ability triggers, blinking Myr Battlesphere.
2. Myr Battlesphere's first ability triggers twice and Soulherder's first ability triggers.
3. Resolve the Soulherder trigger, putting a +1/+1 counter on it.
4. Resolve both Myr Battlesphere triggers, creating eight 1/1 Myr artifact creature tokens.
5. Activate Time Sieve by tapping it and sacrificing five Myrs, causing you to take an extra turn after this one.
6. Repeat each turn.

This elegant engine harnesses Soulherder at the start of your end step to blink Myr Battlesphere, an effect doubled by Elesh Norn, Mother of Machines to instantly flood your board with eight Myr tokens. Those newly minted artifacts, along with the Battlesphere itself, provide the exact fuel needed to activate Time Sieve and instantly claim an extra turn. Meanwhile, Elesh Norn's passive presence safely shuts down your opponents' enter-the-battlefield triggers, and every exiled creature also steadily grows Soulherder into a massive threat as you loop your way to infinite turns.