Kurkesh, Onakke Ancient, Magistrate's Scepter, and Karn's Bastion

Prerequisites

• Kurkesh, Onakke Ancient on the battlefield
• Magistrate's Scepter on the battlefield
• Karn's Bastion on the battlefield
• Magistate's Scepter has at least two charge counters on it
• each turn available

Steps

1. Activate Karn's Bastion's second ability by paying and tapping it, putting a charge counter on Magistrate's Scepter
2. Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it
3. Kurkesh triggers, causing you to pay to copy Magistrate's Scepter's ability
4. Resolve both Magistrate Scepter abilities, causing you to take two extra turns after this one
5. Move to your next turn
6. Activate Magistrate's Scepter's first ability by paying and tapping it
7. Kurkesh triggers, causing you to pay to copy Magistrate's Scepter's ability
8. Resolve both Magistrate Scepter abilities, putting two charge counters on it
9. Move to your next turn
10. Repeat

Results

• Infinite turns