How can you create a combo with Orvar, the All-Form, Clockspinning, Roaming Throne?
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[START OF COMBO]This combo can be formed with Orvar, the All-Form, Clockspinning, Roaming Throne

Color identity: U
Mana cost: {9}{U}{U}{U}
Steps:
  1. Cast Clockspinning with buyback by paying {3}{U}, targeting Roaming Throne.
  2. Orvar triggers twice, creating two token copies of Roaming Throne.
  3. Resolve Clockspinning, returning it to your hand.
  4. Cast Clockspinning with buyback by paying {3}{U}, targeting Roaming Throne.
  5. Orvar triggers four times, creating four token copies of Roaming Throne.
  6. Resolve Clockspinning, returning it to your hand.
  7. Cast Clockspinning with buyback by paying {3}{U}, targeting any nonlegendary permanent you control that enters the battlefield untapped and that can tap to produce at least {U}.
  8. Orvar triggers eight times, creating eight copies of the mana-producing permanent.
  9. Resolve Clockspinning, returning it to your hand.
  10. Activate four of the copies of the mana-producing permanent by tapping them, adding at least {U}{U}{U}{U}.
  11. Repeat from step 7.[END OF COMBO STEPS]

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

Other prerequisites:
  - Orvar, the All-Form must be on the battlefield
  - Clockspinning must be in your hand
  - Roaming Throne 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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