How can you create a combo with Preston, the Vanisher, Karmic Guide, Cloudshift, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Preston, the Vanisher, Karmic Guide, Cloudshift, Ashnod's Altar

Color identity: W
Mana cost: {W}
Steps:
  1. Cast Cloudshift by paying {W}, blinking Karmic Guide.
  2. Karmic Guide enters the battlefield, triggering itself and Preston.
  3. Resolve the Karmic Guide trigger, returning any creature card from your graveyard to the battlefield.
  4. Activate Ashnod's Altar by sacrificing Karmic Guide, adding {C}{C}.
  5. Resolve the Preston trigger from step 2, creating a token copy of Karmic Guide that is a 0/1 white Illusion.
  6. The Karmic Guide token enters the battlefield, returning the nontoken Karmic Guide from your graveyard to the battlefield.
  7. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Preston, the Vanisher must be on the battlefield
  - Karmic Guide must be on the battlefield
  - Cloudshift must be in your hand
  - Ashnod's Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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