Emry, Lurker of the Loch, Coretapper, and Magistrate's Scepter

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Coretapper and Emry do 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 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. Activate Emry by tapping them, allowing you to cast Coretapper from your graveyard this turn
5. Cast Coretapper by paying
6. Repeat each turn

Results

• Infinite turns