Toph, the First Metalbender, Magistrate's Scepter, Rootpath Purifier, and Earthcraft

Prerequisites

• Toph, the First Metalbender on the battlefield
• Magistrate's Scepter on the battlefield
• Rootpath Purifier on the battlefield
• Earthcraft 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 it
2. Activate Earthcraft by tapping a creature, untapping Magistrate's Scepter as it is a basic land due to Toph and Rootpath Purifier
3. Repeat from step 1 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 each turn

Results

• Infinite turns