How can you create a combo with Orvar, the All-Form, Whim of Volrath, Harmonic Prodigy?
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[START OF COMBO]This combo can be formed with Orvar, the All-Form, Whim of Volrath, Harmonic Prodigy

Color identity: UR
Mana cost: {4}{U}{U}
Steps:
  1. Cast Whim of Volrath with buyback by paying {2}{U}, targeting Harmonic Prodigy.
  2. Orvar triggers twice and Harmonic Prodigy triggers once.
  3. Resolve the Harmonic Prodigy trigger, giving it +1/+1 until end of turn.
  4. Resolve the Orvar triggers, creating two token copies of Harmonic Prodigy.
  5. Resolve Whim of Volrath, returning it to your hand.
  6. Cast Whim of Volrath with buyback by paying {2}{U}, targeting any nonlegendary permanent you control that enters the battlefield untapped and that can tap to produce at least {U}.
  7. Orvar triggers four times, and each Harmonic Prodigy triggers three times.
  8. Resolve all Harmonic Prodigy triggers, giving each Harmonic Prodigy +3/+3 until end of turn.
  9. Resolve all Orvar triggers, creating four copies of the mana-producing permanent.
  10. Resolve Whim of Volrath, returning it to your hand.
  11. Activate three of the copies of the mana-producing permanent by tapping them, adding at least {U}{U}{U}.
  12. Repeat from step 6.[END OF COMBO STEPS]

Result:
  - Infinite copies of permanents you control
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite landfall triggers
  - Infinitely large creatures until end of turn
  - Infinite magecraft triggers
  - Infinite mana permanents you control can produce
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Orvar, the All-Form must be on the battlefield
  - Whim of Volrath must be in your hand
  - Harmonic Prodigy must be on the battlefield
  - You control a nonlegendary permanent that enters the battlefield untapped and that can tap to produce at least {U}.
[END OF COMBO PREREQUISITES]
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