Activate Chromatic Orrery's first ability by tapping it, adding ({5} magic symbol) .
Cast Ghostly Flicker either from your hand or from the top of your library by paying ({3} magic symbol) , blinking Chromatic Orrery and Mystic Sanctuary.
Mystic Sanctuary enters the battlefield untapped, putting Ghostly Flicker from your graveyard on top of your library.
Repeat.
Once you have infinite mana, you may instead activate Chromatic Orrery's second ability to draw infinite cards.