Kurkesh, Onakke Ancient, Chromatic Orrery, and Voltaic Key

Prerequisites

• Kurkesh, Onakke Ancient on the battlefield
• Chromatic Orrery on the battlefield
• Voltaic Key on the battlefield

Steps

1. Activate Chromatic Orrery's first ability by tapping it, adding
2. Activate Voltaic Key by paying and tapping it, targeting itself
3. Kurkesh triggers, causing you to pay to copy Voltaic Key's ability, targeting Chromatic Orrery
4. Resolve both Voltaic Key abilities, untapping it and Chromatic Orrery
5. Repeat
6. Once you have a large amount of mana, you may instead use Chromatic Orrey's second ability to draw any number of cards

Results

• Infinite card draw
• Infinite colored mana
• Infinite colorless mana
• Infinite draw triggers
• Infinite untap of artifacts you control