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

Color identity: C
Mana cost: 
Steps:
  1. Activate Everflowing Chalice to add {C}{C}{C}{C} to your mana pool.
  2. Activate Voltaic Key to untap Everflowing Chalice.
  3. Rings of Brighthearth triggers allowing you to copy Voltaic Key's ability and untap Voltaic key with the copy.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite untap of all artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Everflowing Chalice has 4 or more charge counters on it.
[END OF COMBO PREREQUISITES]
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