Inspiring Refrain in hand or in exile with at least one time counter on it.
({1} magic symbol) if Inspiring Refrain is in your hand, or ({2} magic symbol) available if it is in exile available.
Steps
Activate Chromatic Orrery's first ability by tapping it, adding ({5} magic symbol) .
If Inspiring Refrain is in your hand, cast it by paying ({6} magic symbol) .
Otherwise, activate The Tenth Doctor by paying ({7} magic symbol) , 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.
Resolve Inspiring Refrain, causing you to draw two cards and exile Inspiring Refrain with three time counters on it.
Activate Mind over Matter by discarding a card, untapping Chromatic Orrery.
Activate Chromatic Orrery's first ability by tapping it, adding ({5} magic symbol) .
Activate Mind over Matter by discarding a card, untapping Chromatic Orrery.
Repeat.
Results
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.