How can you create a combo with Twincast, Increasing Vengeance?
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[START OF COMBO]This combo can be formed with Twincast, Increasing Vengeance

Color identity: UR
Mana cost: {U}{U}{R}{R}, plus enough mana to cast the additional instant or sorcery
Steps:
  1. Cast any instant or sorcery spell by paying its mana cost.
  2. Holding priority, cast Increasing Vengeance by paying {R}{R}, targeting that spell.
  3. Cast Twincast by paying {U}{U}, copying Increasing Vengeance, with the copy targeting Increasing Vengeance.
  4. Resolve the copy of Increasing Vengeance, copying the original Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
  5. Repeat step 4.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be in your hand
  - You have an additional instant and/or sorcery card in hand.
[END OF COMBO PREREQUISITES]
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