Jin-Gitaxias, Progress Tyrant + Venser, Shaper Savant + Panharmonicon + Time Warp

Jin-Gitaxias, Progress Tyrant

Venser, Shaper Savant

Panharmonicon

Time Warp

How it works

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

This loop turns a single extra turn spell into an endless timeline by constantly bouncing its pieces back to your hand. When you cast Time Warp, Jin-Gitaxias, Progress Tyrant steps in to double your spell output by copying it for free, while Panharmonicon supercharges Venser, Shaper Savant as he enters so you can simultaneously scoop up your original Time Warp *and* Venser himself back to your hand. This leaves you free to replay everything on your next turn and repeat the process indefinitely, all while Jin-Gitaxias's passive ability stands guard to automatically counter the first artifact, instant, or sorcery your opponents try to cast.