Impostor Syndrome, Time Sieve, and Myr Battlesphere

Prerequisites

• Impostor Syndrome on the battlefield
• Time Sieve on the battlefield
• Myr Battlesphere on the battlefield

Steps

1. Deal combat damage to an opponent using Myr Battlesphere, triggering Impostor Syndrome, creating a token copy of Myr Battlesphere
2. When the Myr Battlesphere token enters, it triggers, creating four 1/1 Myr artifact creature tokens
3. Activate Time Sieve by tapping it, sacrificing the four Myr tokens and sacrificing the Myr Battlesphere token, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns