How can you create a combo with Underworld Breach, Diligent Excavator, Thassa's Oracle, Clever Impersonator?
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[START OF COMBO]This combo can be formed with Underworld Breach, Diligent Excavator, Thassa's Oracle, Clever Impersonator

Color identity: UR
Mana cost: {U}{U}
Steps:
  1. Cast the artifact creature from your hand by paying {0}.
  2. Diligent Excavator and Clever Impersonator trigger, causing you to mill four cards.
  3. The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
  4. Cast the artifact creature from your graveyard for its escape cost by paying {0} and exiling any three cards from your graveyard, except Thassa's Oracle if it is in your graveyard.
  5. Repeat from step 2 until you have an empty library.
  6. If Thassa's Oracle is in your hand, cast it by paying {U}{U}.
  7. Otherwise, cast Thassa's Oracle  from your graveyard for its escape cost by paying {U}{U} and exiling three cards from your graveyard.
  8. Thassa's Oracle enters the battlefield, causing you to win the game.[END OF COMBO STEPS]

Result:
  - Infinite self-mill
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite storm count
  - Win the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Underworld Breach must be on the battlefield
  - Diligent Excavator must be on the battlefield
  - Thassa's Oracle must be in your hand or in the graveyard or in the library
  - Clever Impersonator must be on the battlefield
  - Clever Impersonator is a copy of Diligent Excavator.
[END OF COMBO PREREQUISITES]
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