Teleportation Circle + Eternal Witness + Time Stretch

Teleportation Circle

Eternal Witness

Time Stretch

How it works

1. Cast Time Stretch by paying 8, causing you to take two extra turns after this one.
2. At the beginning of your end step, Teleportation Circle triggers, blinking Eternal Witness.
3. When Eternal Witness enters the battlefield, it triggers, returning Time Stretch to your hand from your graveyard.
4. Repeat during each even-numbered extra turn.