How can you create a combo with Vadrik, Astral Archmage, Mystic Retrieval, Runic Repetition, Turnabout?
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[START OF COMBO]This combo can be formed with Vadrik, Astral Archmage, 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}, untapping all lands you control.
  3. Cast Mystic Retrieval by paying {U}, returning Turnabout from your graveyard to your hand.
  4. 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.
  5. Cast Runic Repetition by paying {U}, returning Mystic Retrieval from exile to your hand.
  6. Repeat.
  7. 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:
  - Vadrik, Astral Archmage 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
  - Vadrik has power 3 or greater.
  - Lands you control can tap to produce at least {U}{U}{U}{U}{R}.
[END OF COMBO PREREQUISITES]
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