Double Vision + Venser, Shaper Savant + Naban, Dean of Iteration + 1 more

Cast Nexus of Fate by paying .

Double Vision triggers, creating a copy of Nexus of Fate.

Holding priority, cast Venser by paying .

Venser enters the battlefield, returning itself and original Nexus of Fate to your hand.

Resolve the Nexus of Fate copy, causing you to take an extra turn after this one.

Move to your extra turn.

Repeat.