Isochron Scepter, Final Fortune, and Sundial of the Infinite

Prerequisites

• Isochron Scepter on the battlefield
• Final Fortune in exile
• Sundial of the Infinite on the battlefield
• each turn available

Steps

1. Activate Isochron Scepter by paying , casting a copy of Final Fortune without paying its mana cost
2. Resolve the Final Fortune, taking an extra turn after this one
3. At the beginning of each extra turn's end step, Final Fortune triggers
4. Holding priority, activate Sundial of the Infinite by paying and tapping it, ending the turn
5. Repeat

Results

• Infinite turns