How can you create a combo with March of the Machines, Chromatic Orrery, Umbral Mantle?
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[START OF COMBO]This combo can be formed with March of the Machines, Chromatic Orrery, Umbral Mantle

Color identity: U
Mana cost: 
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {C}{C}{C}{C}{C}.
  2. Activate Chromatic Orrery by paying {3} and untapping it, giving itself +2/+2 until end of turn.
  3. Repeat.
  4. Once you have an infinite amount of {C}, you may use it to activate Chromatic Orrery's last ability.[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
  - Umbral Mantle attached to Chromatic Orrery.
  - Chromatic Orrery does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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