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

Color identity: C
Mana cost: 
Steps:
  1. Activate Metalworker and reveal 2 artifacts to add {C}{C}{C}{C} to your mana pool.
  2. Activate Voltaic Key to untap Metalworker.
  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
  - 2 or more artifacts in hand.
  - Metalworker does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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