How can you create a combo with Fractured Identity, Gather Specimens, Dualcaster Mage?
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[START OF COMBO]This combo can be formed with Fractured Identity, Gather Specimens, Dualcaster Mage

Color identity: URW
Mana cost: {7}{U}{U}{U}{U}{R}{R}{W}
Steps:
  1. Cast Gather Specimens by paying {3}{U}{U}{U}, causing all creatures that would be created under an opponent's control this turn to be created under you control instead.
  2. Cast Fractured Identity by paying {3}{W}{U}, targeting any permanent.
  3. Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
  4. Dualcaster Mage enters the battlefield, creating a copy of Fractured Identity, targeting Dualcaster Mage.
  5. Resolve the copy of Fractured Identity, exiling Dualcaster Mage and creating a copy of Dualcaster Mage for each opponent you have.
  6. The Dualcaster Mage token(s) enter the battlefield, creating a copy of Fractured Identity targeting Dualcaster Mage, and any other instants and/or sorceries on the stack.
  7. Repeat from step 5.
  8. You may also have the additional triggers target permanents your opponent control to exile them and create token copies of them.[END OF COMBO STEPS]

Result:
  - Exile any number of nonland permanents
  - Infinite copies of any instants and/or sorceries on the stack
  - Infinite copies of any nonland permanents on the battlefield
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be in your hand
[END OF COMBO PREREQUISITES]
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