How can you create a combo with Karn, Silver Golem, Doubling Cube, Umbral Mantle?
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[START OF COMBO]This combo can be formed with Karn, Silver Golem, Doubling Cube, Umbral Mantle

Color identity: C
Mana cost: {10}
Steps:
  1. Activate Karn by paying {1}, causing Doubling Cube to become an artifact creature until end of turn.
  2. Activate Umbral Mantle's equip ability by paying {0}, attaching it to Doubling Cube.
  3. Float at least {10} in your mana pool.
  4. Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
  5. Activate Doubling Cube by paying {3} and untapping it, giving it +2/+2 until end of turn.
  6. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinitely large Doubling Cube until end of turn
  - Infinite mana permanents 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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