There is no Mystic Light option available, but there is Ambient Link which, when selected, says 'Please insert MSI Gear devices to enable Mystic Light function'. I opened up Dragon Centre and downloaded all of the latest drivers, since that supposedly makes Mystic Light available in the home tab of Dragon Centre.
Neat, but not my personal preference in colour. I booted it up and the keyboard back-lighting and fancy light strip in the front glowed with a sliding gradient of blue and lighter blue. I had just recently received my new MSI GE66 Raider with Mystic Light RGB keyboard.