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

Color identity: C
Mana cost: 
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  2. Activate Karn by paying {1}, causing Chromatic Orrery to become an artifact creature until end of turn.
  3. Activate Umbral Mantle's equip ability by paying {0}, attaching it to Chromatic Orrery.
  4. Activate Chromatic Orrery by paying {3} and untapping it, giving it +2/+2 until end of turn.
  5. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  6. Repeat from step 4.
  7. Once you have infinite mana, you may instead use Chromatic Orrery's second ability if you control a colored permanent.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite draw triggers
  - Infinitely large Chromatic Orrery until end of turn[END OF COMBO RESULT][END OF COMBO]

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