Wormfang Manta, The Mighty Thor, Jane Foster, and Karn, Argent Defender

Prerequisites

• Wormfang Manta on the battlefield
• The Mighty Thor, Jane Foster on the battlefield
• Karn, Argent Defender on the battlefield

Steps

1. Declare The Mighty Thor as an attacker, attacking an opponent that cannot kill it in combat
2. When The Mighty Thor attacks, it triggers, blinking Wormfang Manta
3. When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one
4. Wormfang Manta entering does not cause its abillity to trigger due to Karn
5. Repeat each turn

Results

• Infinite turns
• Lock