Kykar, Zephyr Awakener + Eternal Witness + Time Walk

Kykar, Zephyr Awakener

Eternal Witness

Time Walk

How it works

1. Cast Time Walk by paying its mana cost.
2. Kykar triggers, exiling Eternal Witness.
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 Eternal Witness from exile to the battlefield.
5. When Eternal Witness enters, it triggers, returning Time Walk from your graveyard to your hand.
6. Repeat each turn.