How can you create a combo with Karn, the Great Creator, Pemmin's Aura, Coveted Jewel?
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[START OF COMBO]This combo can be formed with Karn, the Great Creator, Pemmin's Aura, Coveted Jewel

Color identity: U
Mana cost: {1}{U}{U}
Steps:
  1. Activate Karn's first loyalty ability, causing Coveted Jewel to become an artifact creature until end of turn.
  2. Cast Pemmin's Aura by paying {1}{U}{U}, enchanting Coveted Jewel.
  3. Activate Coveted Jewel by tapping it, adding {U}{U}{U}.
  4. Activate Pemmin's Aura by paying {U}, untapping Coveted Jewel.
  5. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Karn, the Great Creator must be on the battlefield
  - Pemmin's Aura must be in your hand
  - Coveted Jewel must be on the battlefield
  - Coveted Jewel does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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