Lurrus of the Dream-Den, Magistrate's Scepter, and Coretapper

Prerequisites

• Lurrus of the Dream-Den on the battlefield
• Magistrate's Scepter on the battlefield
• Coretapper on the battlefield
• Coretapper does not have summoning sickness

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, taking an extra turn after this one
4. Cast Coretapper from your graveyard using Lurrus of the Dream-Den's ability by paying
5. Repeat each turn

Results

• Infinite turns