How can you create a combo with The Tenth Doctor, Inspiring Refrain, Mind Over Matter, Chromatic Orrery?
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[START OF COMBO]This combo can be formed with The Tenth Doctor, Inspiring Refrain, Mind Over Matter, Chromatic Orrery

Color identity: UR
Mana cost: {1} if Inspiring Refrain is in your hand, or {2} available if it is in exile
Steps:
  1. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  2. If Inspiring Refrain is in your hand, cast it by paying {6}.
  3. Otherwise, activate The Tenth Doctor by paying {7}, causing you to time travel three times, removing all time counters from Inspiring Refrain and cast Inspiring Refrain from exile without paying its mana cost.
  4. Resolve Inspiring Refrain, causing you to draw two cards and exile Inspiring Refrain with three time counters on it.
  5. Activate Mind over Matter by discarding a card, untapping Chromatic Orrery.
  6. Activate Chromatic Orrery's first ability by tapping it, adding {5}.
  7. Activate Mind over Matter by discarding a card, untapping Chromatic Orrery.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite draw triggers
  - Infinite self-discard triggers
  - Near-infinite card draw
  - Near-infinite colored mana
  - Near-infinite colorless mana
  - Near-infinite looting
  - Near-infinite magecraft triggers
  - Near-infinite storm count
  - Near-infinite untap of permanents you control
  - Near-infinite mana permanents you control can produce
  - Infinite looting[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - The Tenth Doctor must be on the battlefield
  - Inspiring Refrain must be in your hand or exiled
  - Mind Over Matter must be on the battlefield
  - Chromatic Orrery must be on the battlefield
  - Inspiring Refrain in hand or in exile with at least one time counter on it.
[END OF COMBO PREREQUISITES]
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