Voltaic Key, Rings of Brighthearth, and Timeless Lotus

Prerequisites

• Voltaic Key on the battlefield
• Rings of Brighthearth on the battlefield
• Timeless Lotus on the battlefield

Steps

1. Activate Timeless Lotus by tapping it, adding
2. Activate Voltaic Key by paying and tapping it, targeting itself
3. Rings of Brighthearth triggers, causing you to pay to copy Voltaic Key's ability, targeting Timeless Lotus
4. Resolve both Voltaic Key abilities, untapping it and Timeless Lotus
5. Repeat

Results

• Infinite colored mana
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control