Magistrate's Scepter, Coretapper, and Helm of the Host

Prerequisites

• Magistrate's Scepter on the battlefield
• Coretapper on the battlefield
• Helm of the Host on the battlefield
• Helm of the Host attached to Coretapper

Steps

1. At the beginning of combat on your turn, Helm of the Host triggers, creating a token copy of Coretapper with haste
2. Activate the token Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
3. Activate the token Coretapper's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter
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