How can you create a combo with Mirror-Mad Phantasm, Cackling Counterpart?
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[START OF COMBO]This combo can be formed with Mirror-Mad Phantasm, Cackling Counterpart

Color identity: U
Mana cost: {2}{U}{U}{U}
Steps:
  1. Cast Cackling Counterpart by paying {1}{U}{U}, creating a token copy of Mirror-Mad Phantasm.
  2. Activate the Mirror-Mad Phantasm token by paying {1}{U}, shuffling the token into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.[END OF COMBO STEPS]

Result:
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mirror-Mad Phantasm must be on the battlefield
  - Cackling Counterpart must be in your hand
[END OF COMBO PREREQUISITES]
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