Kykar, Zephyr Awakener + Returned Pastcaller + Time Walk

Kykar, Zephyr Awakener

Returned Pastcaller

Time Walk

How it works

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.