Hanna, Ship's Navigator, Coretapper, and Magistrate's Scepter

Prerequisites

• Hanna, Ship's Navigator on the battlefield
• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Coretapper and Hanna 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 Hanna by paying and tapping them, returning Coretapper from your graveyard to your hand
5. Cast Coretapper by paying
6. Repeat each turn

Results

• Infinite turns