Time Sieve, Myr Battlesphere, Soulherder, and Gandalf the White

Prerequisites

• Time Sieve on the battlefield
• Myr Battlesphere on the battlefield
• Soulherder on the battlefield
• Gandalf the White on the battlefield

Steps

1. At the beginning of your end step, Soulherder's second ability triggers, blinking Myr Battlesphere
2. Myr Battlesphere's first ability and Soulherder's first ability trigger twice
3. Resolve both Soulherder triggers, putting two +1/+1 counters 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

Results

• Infinite turns