How can you create a combo with Prototype Portal, Corridor Monitor, Gilded Lotus, Panharmonicon?
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[START OF COMBO]This combo can be formed with Prototype Portal, Corridor Monitor, Gilded Lotus, Panharmonicon

Color identity: U
Mana cost: 
Steps:
  1. Activate Gilded Lotus by tapping it, adding three mana of any color.
  2. Activate Prototype Portal by paying {2} and tapping it, creating a token copy of Corridor Monitor.
  3. The Corridor Monitor token enters the battlefield, untapping Prototype Portal and Gilded Lotus.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Corridor Monitor must be exiled
  - Gilded Lotus must be on the battlefield
  - Panharmonicon must be on the battlefield
[END OF COMBO PREREQUISITES]
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