Time Sieve, Myr Battlesphere, and Bilbo, Thief in the Night

Prerequisites

• Time Sieve on the battlefield
• Myr Battlesphere in the graveyard
• Bilbo, Thief in the Night on the battlefield
• each turn available

Steps

1. Declare Bilbo as an attacker, triggering its ability, causing you to cast Myr Battlesphere from your graveyard by paying
2. When Myr Battlesphere enters, it triggers, creating four 1/1 Myr creature tokens
3. Activate Time Sieve by tapping it, sacrificing Myr Battlesphere and sacrificing the four Myr tokens, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns
• Lock