Inspirit, Flagship Vessel, Magistrate's Scepter, and Combat Celebrant

Prerequisites

• Inspirit, Flagship Vessel on the battlefield
• Magistrate's Scepter on the battlefield
• Combat Celebrant on the battlefield

Steps

1. At the beginning of your combat phase, Inspirit triggers, putting two charge counters on Magistrate's Scepter
2. Declare Combat Celebrant as an attacker, choosing to exert it as it attacks
3. Combat Celebrant triggers, causing you to untap all creatures you control and to get an additional combat phase after this one
4. Move to your second combat phase
5. At the beginning of the combat phase, Inspirit triggers, putting two charge counters on Magistrate's Scepter
6. 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
7. Repeat each turn

Results

• Infinite turns