Wormfang Manta, Mistmeadow Witch, and Karn, Argent Defender

Prerequisites

• Wormfang Manta on the battlefield
• Mistmeadow Witch on the battlefield
• Karn, Argent Defender on the battlefield
• each turn available

Steps

1. Activate Mistmeadow Witch by paying , exiling and returning (at end step) Wormfang Manta
2. When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one
3. Wormfang Manta entering does not cause its abillity to trigger due to Karn
4. Repeat each turn

Results

• Infinite turns
• Lock