How can you create a combo with Doppelgang, Mystic Sanctuary, Commander's Sphere?
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[START OF COMBO]This combo can be formed with Doppelgang, Mystic Sanctuary, Commander's Sphere

Color identity: GU
Mana cost: {12}{G}{U}
Steps:
  1. Cast Doppelgang by paying {12}{G}{U}, creating four token copies of Mystic Sanctuary, Commander's Sphere, and two other permanents that enter the battlefield untapped and can collectively tap to produce at least {2}.
  2. When the Mystic Sanctuary tokens enter the battlefield untapped, they trigger, putting Doppelgang on top of your library from your graveyard.
  3. Activate a Commander's Sphere token's second ability by sacrificing it, causing you to draw Doppelgang.
  4. Activate the four Mystic Sanctuary tokens by tapping them, adding {U}{U}{U}{U}.
  5. Activate the three Commander's Sphere tokens' first abilities by tapping them, adding {2}{G}.
  6. Activate seven of the other permanent tokens created in step 1 by tapping them, adding at least {7}.
  7. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Doppelgang must be in your hand
  - Mystic Sanctuary must be on the battlefield
  - Commander's Sphere must be on the battlefield
  - You control at least two additional Islands.
  - You control at least two additional permanents that enter the battlefield untapped and can collectively tap to produce at least {2} if the two additional Islands enter the battlefield tapped.
[END OF COMBO PREREQUISITES]
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