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

Color identity: UR
Mana cost: {U}{U}{R}{R}, plus enough mana to cast the additional spell if needed
Steps:
  1. Cast any instant or sorcery spell, or wait for an opponent to cast one.
  2. Holding priority, cast Fork by paying {R}{R}, targeting that spell.
  3. Cast Twincast by paying {U}{U}, copying Fork, with the copy targeting Fork.
  4. Resolve the copy of Fork, copying the original Fork, with the copy targeting the original Fork.
  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 a way to cast an additional instant or sorcery, or an opponent is casting one.
[END OF COMBO PREREQUISITES]
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