How can you create a combo with Mirror-Mad Phantasm, Sakashima's Will?
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[START OF COMBO]This combo can be formed with Mirror-Mad Phantasm, Sakashima's Will

Color identity: U
Mana cost: {4}{U}{U}
Steps:
  1. Cast Sakashima's Will by paying {3}{U}, causing you to gain control of a creature an opponent controls, then causing all creatures you control to become a copy of Mirror-Mad Phantasm until end of turn.
  2. Activate the creature your opponent owns by paying {1}{U}, causing its owner to shuffle the creature into their library, and then mill their entire library.[END OF COMBO STEPS]

Result:
  - Infinite mill for target opponent[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mirror-Mad Phantasm must be on the battlefield
  - Sakashima's Will must be in your hand
  - An opponent controls a creature.
  - You control a commander.
[END OF COMBO PREREQUISITES]
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