How can you create a combo with Derevi, Empyrial Tactician, Mycosynth Lattice, City of Shadows, Panharmonicon?
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[START OF COMBO]This combo can be formed with Derevi, Empyrial Tactician, Mycosynth Lattice, City of Shadows, Panharmonicon

Color identity: GWU
Mana cost: 
Steps:
  1. Activate Derevi's ability to put him onto the battlefield from the command zone.
  2. Target City of Shadows with both Derevi's enter the battlefield ability and the copy of that ability from Panharmonicon.
  3. When the copy of Derevi's trigger untaps City of Shadows, activate City of Shadows' first ability, exiling Derevi.
  4. Elect to put Derevi in the command zone.
  5. When Derevi's trigger untapping City of Shadows, activate City of Shadows' second ability to add mana.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite untap[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Derevi, Empyrial Tactician must be in the command zone
  - Mycosynth Lattice must be on the battlefield
  - City of Shadows must be on the battlefield
  - Panharmonicon must be on the battlefield
  - There are at least three storage counters on City of Shadows.
[END OF COMBO PREREQUISITES]
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