Coretapper, Magistrate's Scepter, and Tezzeret the Seeker

Prerequisites

• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Tezzeret the Seeker on the battlefield
• Coretapper does not have summoning sickness
• each turn available

Steps

1. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
2. Activate Magistrate's Scepter's first ability by paying and tapping it, putting a charge counter on it
3. Activate Tezzeret's first loyalty ability by putting a loyalty counter on it, untapping Coretapper and Magistrate's Scepter
4. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
5. 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
6. Repeat each turn

Results

• Infinite turns