Wormfang Manta, Nephalia Smuggler, and Karn, Argent Defender

Prerequisites

• Wormfang Manta on the battlefield
• Nephalia Smuggler on the battlefield
• Karn, Argent Defender on the battlefield
• each turn available

Steps

1. Activate Nephalia Smuggler by paying and tapping it, 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