Cogwork Assembler, Coretapper, and Magistrate's Scepter

Prerequisites

• Cogwork Assembler 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 Cogwork Assembler by paying , 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