Kykar, Zephyr Awakener + Returned Pastcaller + Time Warp

Kykar, Zephyr Awakener

Returned Pastcaller

Time Warp

How it works

1. Cast Time Warp by paying its mana cost.
2. Kykar triggers, exiling Returned Pastcaller.
3. Resolve Time Warp, 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 Warp from your graveyard to your hand.
6. Repeat each turn.