Magistrate's Scepter, and Clock of Omens

Prerequisites

• Magistrate's Scepter on the battlefield
• Clock of Omens on the battlefield
• each turn available

Steps

1. Activate Magistrate's Scepter's first ability by paying and tapping it, putting a charge counter on Magistrate's Scepter
2. Activate Clock of Omens by tapping two artifacts you control, untapping Magistrate's Scepter
3. Repeat two additional times
4. Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one
5. Repeat

Results

• Infinite turns