Trazyn the Infinite, and Magistrate's Scepter

Prerequisites

• Trazyn the Infinite on the battlefield
• Magistrate's Scepter in the graveyard

Steps

1. Activate Trazyn using a Spacecraft's station ability by tapping a creature you control, putting a number of charge counters on Trazyn equal to the creature's power
2. If necessary, repeat step 1 until Trazyn has three or more charge counters on it
3. Activate Trazyn using 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
4. Repeat each turn

Results

• Infinite turns