Voltaic Key + Rings of Brighthearth + The Eternity Elevator

Prerequisites

• The Eternity Elevator has twenty or more charge counters on it.

Steps

1. 1Activate The Eternity Elevator by tapping it, adding at least twenty mana of any color.
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 The Eternity Elevator.
4. 4Resolve both Voltaic Key abilities, untapping it and The Eternity Elevator.
5. 5Repeat.

Effects

• Infinite colored mana
• Infinite colorless mana
• Infinite untap of artifacts you control