Atraxa, Praetors' Voice, Magistrate's Scepter, and Contagion Engine

Prerequisites

• Atraxa, Praetors' Voice on the battlefield
• Magistrate's Scepter on the battlefield
• Contagion Engine on the battlefield
• Magistrate's Scepter has at least one charge counter on it
• each turn available

Steps

1. Activate Contagion Engine by paying and tapping it, putting two charge counters on Magistrate's Scepter
2. At the beginning of your end step, Atraxa triggers, putting a charge counter 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. Repeat each turn

Results

• Infinite turns