Extravagant Replication + Returned Pastcaller + Time Walk

Extravagant Replication

Returned Pastcaller

Time Walk

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 Returned Pastcaller.
4. When the Returned Pastcaller token enters the battlefield, it triggers, returning Time Walk from your graveyard to your hand.
5. Repeat.