Kurkesh, Onakke Ancient, Magistrate's Scepter, and Voltaic Key

Prerequisites

• Kurkesh, Onakke Ancient on the battlefield
• Magistrate's Scepter on the battlefield
• Voltaic Key on the battlefield
• every other turn available

Steps

1. Activate Magistrate's Scepter's first ability by paying and tapping it
2. Kurkesh triggers, causing you to pay to copy Magistrate's Scepter's ability
3. Resolve both Magistrate Scepter abilities, putting two charge counters on it
4. Activate Voltaic Key by paying and tapping it, targeting Magistrate's Scepter
5. Kurkesh triggers, causing you to pay to copy Voltaic Key's ability, targeting Magistrate's Scepter
6. Resolve the copy of Voltaic Key's ability, untapping Magistrate's Scepter
7. Activate Magistrate's Scepter's first ability by paying and tapping it
8. Kurkesh triggers, choose not to pay for the trigger
9. Resolve the Magistrate's Scepter ability, putting a charge counter on it
10. Resolve the Voltaic Key ability from step 4, untapping Magistrate's Scepter
11. Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it
12. Kurkesh triggers, causing you to pay to copy Magistrate's Scepter's ability
13. Resolve both Magistrate Scepter abilities, causing you to take two extra turns after this one
14. Repeat every other turn

Results

• Infinite turns