Double Vision + Venser, Shaper Savant + Panharmonicon + Capture of Jingzhou

Double Vision

Venser, Shaper Savant

Panharmonicon

Capture of Jingzhou

How it works

1. Cast Capture of Jingzhou by paying 3.
2. Double Vision triggers, copying Capture of Jingzhou.
3. Holding priority, cast Venser by paying 2.
4. When Venser enters the battlefield, it triggers twice, returning itself and the original Capture of Jingzhou to your hand from the battlefield and stack respectively.
5. Resolve the copy of Capture of Jingzhou, causing you to take an extra turn after this one.
6. Repeat each turn.

This brilliant loop secures infinite turns and total control by turning a single extra turn spell into a self-sustaining engine. It all begins when you cast Capture of Jingzhou, which Double Vision happily copies so you get your immediate extra turn. To keep the chain going indefinitely, you leverage Panharmonicon to double Venser, Shaper Savant's entry trigger, allowing Venser to bounce both the original Capture of Jingzhou and himself right back to your hand. This leaves Venser ready to be recast on subsequent turns while ensuring you never run out of sorceries to cast, locking down the game one extra turn at a time.