How can you create a combo with Voltaic Construct, Coveted Jewel, Xenic Poltergeist?
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[START OF COMBO]This combo can be formed with Voltaic Construct, Coveted Jewel, Xenic Poltergeist

Color identity: B
Mana cost: 
Steps:
  1. Activate Xenic Poltergeist by tapping it, causing Coveted Jewel to become an artifact creature until your next upkeep.
  2. Activate Coveted Jewel by tapping it, adding three mana of any one color.
  3. Activate Voltaic Construct by paying {2}, untapping Coveted Jewel.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Xenic Poltergeist does not have summoning sickness.
  - Coveted Jewel does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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