How can you create a combo with Errant, Street Artist, Dramatic Reversal, Repeated Reverberation?
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[START OF COMBO]This combo can be formed with Errant, Street Artist, Dramatic Reversal, Repeated Reverberation

Color identity: UR
Mana cost: {1}{R}{R}
Steps:
  1. Activate all mana producing nonland permanents you control by tapping them, adding at least {2}{U}.
  2. Cast Repeated Reverberation by paying {2}{R}{R}, causing you to create two copies of the next instant spell you cast this turn.
  3. Cast Dramatic Reversal by paying {1}{U}.
  4. Repeated Reverberation triggers, creating two copies of Dramatic Reversal.
  5. Resolve a copy of Dramatic Reversal, untapping all nonland permanents you control.
  6. Activate all mana producing nonland permanents you control by tapping them, adding at least {2}{U}.
  7. Activate Errant by paying {1}{U} and tapping it, creating a copy of the Dramatic Reversal copy.
  8. Repeat from step 5.[END OF COMBO STEPS]

Result:
  - Infinite magecraft triggers
  - Infinite mana nonland permanents you control can produce
  - Infinite untap of nonland permanents you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Errant, Street Artist must be on the battlefield
  - Dramatic Reversal must be in your hand
  - Repeated Reverberation must be in your hand
  - Nonland permanents you control can tap to produce at least {2}{U}.
[END OF COMBO PREREQUISITES]
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