How can you create a combo with Thousand-Year Storm, Spelljack?
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[START OF COMBO]This combo can be formed with Thousand-Year Storm, Spelljack

Color identity: UR
Mana cost: {3}{U}{U}{U} plus enough mana to cast the additional instant card
Steps:
  1. Cast any other instant card from your hand by paying its mana cost.
  2. Holding priority, cast Spelljack by paying {3}{U}{U}{U} targeting the instant.
  3. Thousand-Year Storm triggers, creating at least one copy of Spelljack that is targeting the original Spelljack.
  4. Resolve the first copy of Spelljack, countering the original Spelljack and exiling it with the ability to cast it for free from exile.
  5. All remaining copies of Spelljack fail to resolve due to having no legal targets.
  6. Cast Spelljack from exile without paying its mana cost, targeting the instant cast in Step 1.
  7. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Thousand-Year Storm must be on the battlefield
  - Spelljack must be in your hand
  - You have an additional instant card in hand.
[END OF COMBO PREREQUISITES]
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