How can you create a combo with Thrumming Stone, Memory Lapse, Bonus Round?
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[START OF COMBO]This combo can be formed with Thrumming Stone, Memory Lapse, Bonus Round

Color identity: UR
Mana cost: {2}{U}{R}{R}
Steps:
  1. Cast Bonus Round by paying {1}{R}{R}.
  2. Thrumming Stone triggers, revealing the top four cards of your library and putting them on the bottom of your library.
  3. Resolve Bonus Round, copying all instants and sorceries cast after it this turn.
  4. Cast any other spell, or wait for an opponent to cast one.
  5. Cast Memory Lapse by paying {1}{U}, targeting that spell.
  6. Bonus Round and Thrumming Stone trigger.
  7. Resolve the Bonus Round trigger, creating a copy of Memory Lapse, targeting the original Memory Lapse.
  8. Resolve the copy of Memory Lapse, countering the original Memory Lapse and putting it on top of your library.
  9. Resolve the Thrumming Stone trigger from step 6, revealing the top four cards of your library and casting Memory Lapse without paying its mana cost.
  10. Repeat from step 6.[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
  - Bonus Round must be in your hand
[END OF COMBO PREREQUISITES]
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