Roon of the Hidden Realm + Eternal Witness + Walk the Aeons

Roon of the Hidden Realm

Eternal Witness

Walk the Aeons

How it works

1. Cast Walk the Aeons by paying 4, causing you to take an extra turn after this one.
2. Activate Roon by paying 2 and tapping it, exiling Eternal Witness until the beginning of your end step.
3. At the beginning of your end step, Roon triggers, returning Eternal Witness from exile to the battlefield.
4. Eternal Witness enters the battlefield, putting Walk the Aeons into your hand from your graveyard.
5. Repeat each turn.