Double Vision + Venser, Shaper Savant + Panharmonicon + Nexus of Fate

Double Vision

Venser, Shaper Savant

Panharmonicon

Nexus of Fate

How it works

1. Cast Nexus of Fate by paying 5.
2. Double Vision triggers, creating a copy of Nexus of Fate.
3. Holding priority, cast Venser by paying 2.
4. Venser enters the battlefield, returning itself and original Nexus of Fate to your hand.
5. Resolve the Nexus of Fate copy, causing you to take an extra turn after this one.
6. Move to your extra turn.
7. Repeat.