How can you create a combo with Tatyova, Benthic Druid, Doppelgang, Mystic Sanctuary?
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[START OF COMBO]This combo can be formed with Tatyova, Benthic Druid, Doppelgang, Mystic Sanctuary

Color identity: GU
Mana cost: {12}{G}{U}
Steps:
  1. Cast Doppelgang by paying {12}{G}{U}, creating four token copies of Mystic Sanctuary and three other permanents that enter the battlefield untapped and can collectively tap to produce at least {2}{G}.
  2. When the tokens enter the battlefield untapped, each Mystic Sanctuary token triggers, and Tatyova triggers for each land token that entered the battlefield.
  3. Resolve all Mystic Sanctuary triggers, putting Doppelgang on top of your library from your graveyard.
  4. Resolve all Tatyova triggers, causing you to draw that many cards, including Doppelgang with the first draw, and gain that much life.
  5. Activate the four Mystic Sanctuary tokens by tapping them, adding {U}{U}{U}{U}.
  6. Activate ten of the other permanent tokens created in step 1 by tapping them, adding at least {9}{G}.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Near-infinite lifegain
  - Near-infinite lifegain triggers
  - Infinite draw triggers
  - Near-infinite storm count
  - Near-infinite landfall triggers
  - Near-infinite magecraft triggers
  - Near-infinite copies of any permanent on the battlefield
  - Near-infinite Island tokens
  - Near-infinite mana permanents can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Tatyova, Benthic Druid must be on the battlefield
  - Doppelgang must be in your hand
  - Mystic Sanctuary must be on the battlefield
  - You control at least two additional Islands.
  - You control at least three additional permanents that enter the battlefield untapped and can collectively tap to produce at least {2}{G}.
[END OF COMBO PREREQUISITES]
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