How can you create a combo with Karn, Silver Golem, Freed from the Real, Doubling Cube?
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[START OF COMBO]This combo can be formed with Karn, Silver Golem, Freed from the Real, Doubling Cube

Color identity: U
Mana cost: {8}{U}{U}
Steps:
  1. Activate Doubling Cube by paying {3} and tapping it, doubling your unspent mana.
  2. Activate Karn by paying {1}, causing Doubling Cube to become an artifact creature until end of turn.
  3. Cast Freed from the Real by paying {2}{U}, enchanting Doubling Cube.
  4. Activate Freed from the Real's second ability by paying {U}, untapping Doubling Cube.
  5. Activate Doubling Cube by paying {3} and tapping it, doubling your unspent mana.
  6. Repeat from step 4.[END OF COMBO STEPS]

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

Other prerequisites:
  - Karn, Silver Golem must be on the battlefield
  - Freed from the Real must be in your hand
  - Doubling Cube must be on the battlefield
[END OF COMBO PREREQUISITES]
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