Time Sieve + Myr Battlesphere + Thassa, Deep-Dwelling + Panharmonicon

Time Sieve

Myr Battlesphere

Thassa, Deep-Dwelling

Panharmonicon

How it works

1. At the beginning of your end step, Thassa triggers, blinking Myr Battlesphere.
2. When Myr Battlesphere enters the battlefield, its first ability triggers twice, creating eight 1/1 Myr artifact creature tokens.
3. Activate Time Sieve by tapping it and sacrificing five Myrs, causing you to take an extra turn after this one.
4. Repeat each turn.

By leveraging Panharmonicon, we double the entry trigger of Myr Battlesphere to instantly flood the board with eight Myr artifact tokens every single cycle. Thassa, Deep-Dwelling then resets this cycle reliably at each end step by blinking the Battlesphere back into play to generate fresh fodder. With your artifact count overflowing, Time Sieve gladly devours five of those tiny constructs to string together infinite extra turns and completely lock your opponents out of the game.