Wormfang Manta, Aminatou, the Fateshifter, Carth the Lion, and Karn, Argent Defender

Prerequisites

• Wormfang Manta on the battlefield
• Aminatou, the Fateshifter on the battlefield
• Carth the Lion on the battlefield
• Karn, Argent Defender on the battlefield

Steps

1. Activate Aminatou by putting 0 loyalty counter on them due to Carth the Lion, blinking 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