Urza, Prince of Kroog, Coretapper, and Magistrate's Scepter

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Coretapper on the battlefield
• Magistrate's Scepter 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 Urza by paying , creating a token copy of Coretapper that is a 1/1 Soldier
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