How can you create a combo with Voltaic Key, Empowered Autogenerator, Rings of Brighthearth?
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[START OF COMBO]This combo can be formed with Voltaic Key, Empowered Autogenerator, Rings of Brighthearth

Color identity: C
Mana cost: 
Steps:
  1. Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding one mana of any color for each charge counter on Empowered Autogenerator.
  2. Activate Voltaic Key by paying {1} and tapping it, targeting Empowered Autogenerator.
  3. Rings of Brighthearth triggers, costing you {2} to copy Voltaic Key's ability, targeting Voltaic Key.
  4. Resolve both Voltaic Key abilities, untapping Voltaic Key and Empowered Autogenerator.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite charge counters on Empowered Autogenerator
  - Infinite colored mana
  - Infinite mana artifacts you control can produce
  - Infinite untap of artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Empowered Autogenerator has at least two charge counters on it.
[END OF COMBO PREREQUISITES]
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