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

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