Wormfang Manta, Brago, King Eternal, and Karn, Argent Defender

Prerequisites

• Wormfang Manta on the battlefield
• Brago, King Eternal on the battlefield
• Karn, Argent Defender on the battlefield

Steps

1. Declare Brago as an attacker attacking a player who cannot block it
2. When Brago deals combat damage to a player, 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