Lithoform Engine, Corridor Monitor, Chromatic Orrery, and Panharmonicon

Prerequisites

• Lithoform Engine on the battlefield
• Corridor Monitor in hand
• Chromatic Orrery on the battlefield
• Panharmonicon on the battlefield
• available

Steps

1. Cast Corridor Monitor for
2. With Corridor Monitor on the stack, use Lithoform Engine to copy the spell, using Chromatic Orrery to pay for Lithoform Engine
3. Let the copy of Corridor Monitor resolve, triggering Corridor Monitor twice due to Panharmonicon, untapping Chromatic Orrery and Lithoform Engine
4. Repeat steps 2-3

Results

• Infinite colored mana
• Infinite colorless mana
• Infinite ETB