How can you create a combo with Orvar, the All-Form, Storm-Kiln Artist, Sea Gate Stormcaller, Unsubstantiate?
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[START OF COMBO]This combo can be formed with Orvar, the All-Form, Storm-Kiln Artist, Sea Gate Stormcaller, Unsubstantiate

Color identity: UR
Mana cost: {2}{U}{U}
Steps:
  1. Cast Sea Gate Stormcaller by paying {1}{U}.
  2. Sea Gate Stormcaller enters the battlefield, copying the next instant or sorcery spell you cast with mana value two or less.
  3. Cast Unsubstantiate by paying {1}{U}, targeting Sea Gate Stormcaller.
  4. Sea Gate Stormcaller, Orvar, and Storm-Kiln Artist trigger.
  5. Resolve the Sea Gate Stormcaller trigger, copying Unsubstantiate, targeting the original Unsubstantiate.
  6. Storm-Kiln Artist triggers, creating a Treasure token.
  7. Resolve the copy of Unsubstantiate, returning the original Unsubstantiate to your hand.
  8. Resolve the Orvar trigger, creating a token copy of Sea Gate Stormcaller.
  9. The Sea Gate Stormcaller token enters the battlefield, copying the next instant or sorcery spell you cast with mana value two or less.
  10. Resolve the Storm-Kiln Artist trigger from step 4, creating a Treasure token.
  11. Activate both Treasure tokens by tapping and sacrificing them, adding {U}{U}.
  12. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Orvar, the All-Form must be on the battlefield
  - Storm-Kiln Artist must be on the battlefield
  - Sea Gate Stormcaller must be in your hand
  - Unsubstantiate must be in your hand
[END OF COMBO PREREQUISITES]
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