Coretapper, Magistrate's Scepter, and Teferi, Who Slows the Sunset

Prerequisites

• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Teferi, Who Slows the Sunset 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 Magistrate's Scepter's first ability by paying and tapping it, putting a charge counter on it
3. Activate Teferi's first loyalty ability by putting a loyalty counter on it, untapping Coretapper and Magistrate's Scepter and causing you to gain two life
4. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
5. 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
6. Repeat each turn

Results

• Infinite turns