How can you create a combo with Preston, the Vanisher, Karmic Guide, Clever Impersonator?
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[START OF COMBO]This combo can be formed with Preston, the Vanisher, Karmic Guide, Clever Impersonator

Color identity: WU
Mana cost: {3}{W}{W}
Steps:
  1. Cast Karmic Guide by paying {3}{W}{W}.
  2. When Karmic Guide enters the battlefield, it triggers, returning Clever Impersonator to the battlefield from your graveyard.
  3. Choose not to have Clever Impersonator copy anything as it enters the battlefield.
  4. Clever Impersonator dies as a state-based action due to having zero toughness.
  5. Preston triggers, creating a copy of Clever Impersonator that is a 0/1 Illusion.
  6. Choose to have the Clever Impersonator token enter the battlefield as a copy of Karmic Guide.
  7. When the Clever Impersonator token enters the battlefield, it triggers, returning the nontoken Clever Impersonator to the battlefield from your graveyard.
  8. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Preston, the Vanisher must be on the battlefield
  - Karmic Guide must be in your hand
  - Clever Impersonator must be in the graveyard
[END OF COMBO PREREQUISITES]
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