Kykar, Zephyr Awakener, Returned Pastcaller, and Time Walk

Prerequisites

• Kykar, Zephyr Awakener on the battlefield
• Returned Pastcaller on the battlefield
• Time Walk in hand
• each turn available

Steps

1. Cast Time Walk by paying its mana cost
2. Kykar triggers, exiling Returned Pastcaller
3. Resolve Time Walk, causing you to take an extra turn after this one
4. At the beginning of your end step, Kykar triggers, returning Returned Pastcaller from exile to the battlefield
5. When Returned Pastcaller enters, it triggers, returning Time Walk from your graveyard to your hand
6. Repeat each turn

Results

• Infinite turns
• Lock