Time Sieve, Myr Battlesphere, Soulherder, and Thopter Spy Network

Prerequisites

• Time Sieve on the battlefield
• Myr Battlesphere on the battlefield
• Soulherder on the battlefield
• Thopter Spy Network on the battlefield

Steps

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, Soulherder's second ability triggers, blinking Myr Battlesphere
3. When Myr Battlesphere enters the battlefield, it and Soulherder's first abilities trigger
4. Resolve the Soulherder trigger, putting a +1/+1 counter on it
5. Resolve the Myr Battlesphere trigger, creating four 1/1 Myr artifact creature tokens
6. Activate Time Sieve by tapping it, sacrificing the Thopter and the four Myrs, causing you to take an extra turn after this one
7. Repeat each turn

Results

• Infinite turns