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

Color identity: U
Mana cost: {U}
Steps:
  1. Activate all mana producing nonland permanents you control by tapping them, adding at least {2}{U}.
  2. Cast Dramatic Reversal by paying {1}{U}.
  3. Swarm Intelligence triggers, creating a copy of Dramatic Reversal.
  4. Activate Errant by paying {1}{U} and tapping it, creating a copy of the Dramatic Reversal copy.
  5. Resolve the first Dramatic Reversal copy, untapping all nonland permanents you control.
  6. Activate all mana producing nonland permanents you control by tapping them, adding at least {2}{U}.
  7. Repeat from step 4.[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
  - Swarm Intelligence must be on the battlefield
  - Nonland permanents you control can tap to produce at least {2}{U}.
[END OF COMBO PREREQUISITES]
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