How can you create a combo with Mizzix of the Izmagnus, Mystic Retrieval, Runic Repetition, Turnabout?
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[START OF COMBO]This combo can be formed with Mizzix of the Izmagnus, Mystic Retrieval, Runic Repetition, Turnabout

Color identity: UR
Mana cost: 
Steps:
  1. Activate all mana-producing lands you control by tapping them, adding at least {U}{U}{U}{U}{R}.
  2. Cast Turnabout by paying {U}{U}.
  3. If you have fewer than three experience counters, Mizzix of the Izmagnus triggers, causing you to get an experience counter.
  4. Resolve Turnabout, untapping all lands you control.
  5. Cast Mystic Retrieval by paying {U}, returning Turnabout from your graveyard to your hand.
  6. Cast Mystic Retrieval from your graveyard for its flashback cost by paying {R}, returning Runic Repetition from your graveyard to your hand and exiling Mystic Retrieval.
  7. Cast Runic Repetition by paying {U}, returning Mystic Retrieval from exile to your hand.
  8. Repeat.
  9. If lands you control can tap to produce at least {1}{U}{U}{U}{U}{R}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite magecraft triggers
  - Infinite mana permanents you control can produce
  - Infinite storm count
  - Infinite untap of permanents you control
  - Instant/Sorcery with "Return Instant/Sorcery from GY to hand"[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mizzix of the Izmagnus must be on the battlefield
  - Mystic Retrieval must be in your hand
  - Runic Repetition must be in the graveyard
  - Turnabout must be in your hand
  - You have at least two experience counters.
  - Lands you control can tap to produce at least {U}{U}{U}{U}{R}.
[END OF COMBO PREREQUISITES]
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