How can you create a combo with Voltaic Construct, Coveted Jewel, The Blackstaff of Waterdeep?
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[START OF COMBO]This combo can be formed with Voltaic Construct, Coveted Jewel, The Blackstaff of Waterdeep

Color identity: U
Mana cost: {1}{U}
Steps:
  1. Activate The Blackstaff of Waterdeep by paying {1}{U} and tapping it, causing Coveted Jewel to become an artifact creature.
  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
  - Coveted Jewel does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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