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

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 Mirror Image to the battlefield from your graveyard.
  3. Choose not to have Mirror Image copy anything as it enters the battlefield.
  4. Mirror Image dies as a state-based action due to having zero toughness.
  5. Preston triggers, creating a copy of Mirror Image that is a 0/1 Illusion.
  6. Choose to have the Mirror Image token enter the battlefield as a copy of Karmic Guide.
  7. When the Mirror Image token enters the battlefield, it triggers, returning the nontoken Mirror Image 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
  - Mirror Image must be in the graveyard
[END OF COMBO PREREQUISITES]
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