How can you create a combo with Derevi, Empyrial Tactician, Chromatic Orrery, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Derevi, Empyrial Tactician, Chromatic Orrery, Altar of Dementia

Color identity: GWU
Mana cost: 
Steps:
  1. Tap Chromatic Orrery for 5 {C}.
  2. Activate Derevi to put it into play and untap Chromatic Orrery with its enter the battlefield trigger.
  3. Sacrifice Derevi to Altar.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite untap[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Derevi, Empyrial Tactician must be in the command zone
  - Chromatic Orrery must be on the battlefield
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
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