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

Color identity: UR
Mana cost: {1}{U}
Steps:
  1. Cast any other spell, or wait for an opponent to cast one.
  2. Cast Memory Lapse by paying {1}{U}, targeting that spell.
  3. Thousand-Year Storm and Thrumming Stone trigger.
  4. Resolve the Thousand-Year Storm trigger, creating at least one copy of Memory Lapse, with each copy targeting the original Memory Lapse.
  5. Resolve the first copy of Memory Lapse, countering the original Memory Lapse and putting it on top of your library.
  6. All remaining Memory Lapse copies fizzle due to no longer having a legal target.
  7. Resolve the Thrumming Stone trigger from step 3, revealing the top four cards of your library and casting Memory Lapse without paying its mana cost.
  8. Repeat from step 3.[END OF COMBO STEPS]

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

Other prerequisites:
  - Thrumming Stone must be on the battlefield
  - Memory Lapse must be in your hand
  - Thousand-Year Storm must be on the battlefield
  - You have cast at least one instant and/or sorcery this turn.
[END OF COMBO PREREQUISITES]
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