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

Color identity: GWU
Mana cost: 
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  2. Cast a nonartifact creature card from your hand by paying at most {2}.
  3. When the creature enters the battlefield, Cloudstone Curio triggers, returning Derevi from the battlefield to your hand.
  4. Cast Derevi by paying {3}.
  5. When Derevi enters the battlefield, it and Cloudstone Curio trigger.
  6. Resolve the Cloudstone Curio trigger, returning the creature cast in step 2 from the battlefield to your hand.
  7. Resolve the Derevi trigger, untapping Cloudstone Curio.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite storm count
  - Infinite card draw
  - Infinite mana permanents you control can produce
  - Infinite untap of permanents you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have a nonartifact creature card in hand that can be cast using two mana or less.
[END OF COMBO PREREQUISITES]
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