Moxite Refinery, Magistrate's Scepter, Mossborn Hydra, and Guildless Commons

Prerequisites

• Moxite Refinery on the battlefield
• Magistrate's Scepter on the battlefield
• Mossborn Hydra on the battlefield
• Guildless Commons in hand
• each turn available

Steps

1. Play Guildless Commons
2. When it enters, it and Mossborn Hydra trigger
3. Resolve the Guildless Commons trigger, returning it from the battlefield to your hand
4. Resolve the Mossborn Hydra trigger, doubling the number of +1/+1 counters on it
5. Activate Moxite Refinery by paying , tapping it and removing three +1/+1 counters from Mossborn Hydra, putting three charge counters on Magistrate's Scepter
6. 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
7. Repeat each turn

Results

• Infinite turns