Prototype Portal, Corridor Monitor, Gilded Lotus, and Doubling Season

Prerequisites

• Prototype Portal on the battlefield
• Corridor Monitor in exile
• Gilded Lotus on the battlefield
• Doubling Season on the battlefield

Steps

1. Activate Gilded Lotus by tapping it, adding three mana of any color
2. Activate Prototype Portal by paying and tapping it, creating two token copies of Corridor Monitor
3. The Corridor Monitor tokens enter the battlefield, untapping Prototype Portal and Gilded Lotus
4. Repeat

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite ETB