Time Sieve, Myr Battlesphere, and Sword of Light and Shadow

Prerequisites

• Time Sieve on the battlefield
• Myr Battlesphere in the graveyard
• Sword of Light and Shadow on the battlefield
• Sword of Light and Shadow attached to a creature you control that does not have summoning sickness and that cannot be blocked by an opponent
• each turn available

Steps

1. Deal combat damage to an opponent using the creature that has Sword of Light and Shadow attached
2. Sword of Light and Shadow triggers, causing you to gain three life and return Myr Battlesphere from your graveyard to your hand
3. Cast Myr Battlesphere by paying
4. When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr creature tokens
5. 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
6. Repeat each turn

Results

• Infinite turns