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

Color identity: UR
Mana cost: {4}{U/R}{U/R}{R}{R}{R} (at most), plus an additional {1} or {R}{R}
Steps:
  1. Cast Apex of Power by paying at most {4}{R}{R}{R}.
  2. If you have fewer than ten experience counters, Mizzix of the Izmagnus triggers, causing you to get an experience counter.
  3. Resolve Apex of Power, exiling the top seven cards of your library with the ability to cast them until end of turn, and adding either ten {U} or ten {R}.
  4. Cast Mystic Retrieval by paying {U}, returning Apex of Power from your graveyard to your hand.
  5. 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.
  6. Cast Runic Repetition by paying {U}, returning Mystic Retrieval from exile to your hand.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Cast all cards in your library
  - Infinite colored mana
  - 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
  - Apex of Power must be in your hand
  - You have at least three experience counters.
[END OF COMBO PREREQUISITES]
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