Voltaic Key + Rings of Brighthearth + Nyx Lotus

Prerequisites

• Your devotion to any color is at least four.

Steps

1. 1Activate Nyx Lotus by tapping it, adding at least four mana of any color with which you have devotion.
2. 2Activate Voltaic Key by paying and tapping it, targeting itself.
3. 3Rings of Brighthearth triggers, causing you to pay to copy Voltaic Key's ability, targeting Nyx Lotus.
4. 4Resolve both Voltaic Key abilities, untapping it and Nyx Lotus.
5. 5Repeat.

Effects

• Infinite mana among colors with which you have devotion
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control