How can you create a combo with Karn, the Great Creator, Doubling Cube, Sword of the Paruns?
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[START OF COMBO]This combo can be formed with Karn, the Great Creator, Doubling Cube, Sword of the Paruns

Color identity: C
Mana cost: {11}
Steps:
  1. Float at least {11} in your mana pool.
  2. Activate Doubling Cube by paying {3} and tapping it, adding at least {8}.
  3. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
  4. Activate Sword of the Paruns' equip ability by paying {3}, attaching it to Doubling Cube.
  5. Activate Sword of the Paruns by paying {3}, untapping Doubling Cube.
  6. Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
  7. Repeat from step 5.[END OF COMBO STEPS]

Result:
  - Infinite mana permanents you control can produce
  - Infinite untap of creatures you control
  - Infinite mana creatures you control can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Doubling Cube does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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