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

Color identity: U
Mana cost: {3}{U}{U}
Steps:
  1. Cast Polymorphous Rush by paying {2}{U}, causing another creature you control to become a copy of Mirror-Mad Phantasm until end of turn.
  2. Activate the creature by paying {1}{U}, shuffling it 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
  - Polymorphous Rush must be in your hand
  - You control at least one additional creature.
[END OF COMBO PREREQUISITES]
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