Extravagant Replication + Returned Pastcaller + Walk the Aeons

Extravagant Replication

Returned Pastcaller

Walk the Aeons

How it works

1. Cast Walk the Aeons 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 Walk the Aeons from your graveyard to your hand.
5. Repeat.