Extravagant Replication + Returned Pastcaller + Capture of Jingzhou

Extravagant Replication

Returned Pastcaller

Capture of Jingzhou

How it works

1. Cast Capture of Jingzhou 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 Capture of Jingzhou from your graveyard to your hand.
5. Repeat.

This brilliant loop achieves infinite turns by recycling a single copy of Capture of Jingzhou over and over again. During your upkeep, Extravagant Replication dutifully mints a fresh token copy of Returned Pastcaller. Each time that token arrives, its entrance trigger reaches into your graveyard to hand you back Capture of Jingzhou, which you then cast to secure yet another extra turn.