How can you create a combo with Bonus Round, Turnabout, Strionic Resonator?
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[START OF COMBO]This combo can be formed with Bonus Round, Turnabout, Strionic Resonator

Color identity: UR
Mana cost: {3}{R}{R}{U}{U}
Steps:
  1. Cast Bonus Round by paying {1}{R}{R}, creating an ability that will trigger each time a player casts an instant or sorcery spell this turn.
  2. Cast Turnabout by paying {2}{U}{U}.
  3. When you cast Turnabout, the ability created by Bonus Round in step 1 triggers.
  4. In response, activate Strionic Resonator by paying {2} and tapping it, copying the ability from Bonus Round.
  5. Resolve the copied ability, copying Turnabout.
  6. Resolve the copy of Turnabout, untapping Strionic Resonator and all other artifacts you control.
  7. Activate artifacts you control by tapping them, adding at least {2}.
  8. Repeat from step 4 any number of times.
  9. If you can add at least {3} in step 7, this combo produces infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite magecraft triggers
  - Infinite mana artifacts you control can produce
  - Infinite untaps of artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Bonus Round must be in your hand
  - Turnabout must be in your hand
  - Strionic Resonator must be on the battlefield
  - You control artifacts that can produce at least {2}.
[END OF COMBO PREREQUISITES]
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