Extravagant Replication + Time Walk + Timeless Witness

Extravagant Replication

Time Walk

Timeless Witness

How it works

1. Cast Time Walk by paying its mana cost, causing you to take an extra turn after this one.
2. Move to your next turn.
3. At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Timeless Witness.
4. When the Timeless Witness token enters the battlefield, it triggers, returning Time Walk from your graveyard to your hand.
5. Repeat.