How can you create a combo with Isochron Scepter, Narset's Reversal, Hidden Strings, Chromatic Orrery?
user
[START OF COMBO]This combo can be formed with Isochron Scepter, Narset's Reversal, Hidden Strings, Chromatic Orrery

Color identity: U
Mana cost: 
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  2. Cast HIdden Strings by paying {2}, targeting any two applicable targets.
  3. Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Narset's Reversal without paying its mana cost.
  4. Resolve Narset's Reversal, returning Hidden Strings to your hand and creating a copy of it, targeting Isochron Scepter and Chromatic Orrery.
  5. Resolve the copy of Hidden Strings, untapping Isochron Scepter and Chromatic Orrery.
  6. Repeat.
  7. Once you have infinite mana, you may use Chromatic Orrery's second ability if you control a colored permanent and/or untap any other permanent(s) you control.[END OF COMBO STEPS]

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

Other prerequisites:
  - Isochron Scepter must be on the battlefield
  - Narset's Reversal must be exiled
  - Hidden Strings must be in your hand
  - Chromatic Orrery must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant