Mirko, Obsessive Theorist, Coretapper, Magistrate's Scepter, and Hex Parasite

Prerequisites

• Mirko, Obsessive Theorist on the battlefield
• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Hex Parasite on the battlefield
• Coretapper does not have summoning sickness
• Mirko has at least 2 power
• each turn available

Steps

1. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
2. Activate Coretapper's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter
3. 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
4. At the beginning of your end step, Mirko's last ability triggers, returning Coretapper from your graveyard to the battlefield with a finality counter on it
5. Activate Hex Parasite by paying , removing the finality counter from Coretapper and giving Hex Parasite +1/+0 until end of turn
6. Repeat each turn

Results

• Infinite turns