Here's the history of this flourish:

This is the fabled DeCourcey Shuffle - named for the Swiss card magician Howard De Courcey (1914-1990).

The interweave at the end (The Notis Cascade) was a further elaboration developed in the 1950s by Senor Notis - an Argentinian card manipulator.

Ricky Jay performed this move in a cameo appearance on an episode of the X-Files in the 1990s - that's when I decided to learn it.

... If you are seriously interested, I can hook you up with some detailed instructions!
Keep creating!

Thanks for watching! ... Vote me up!! This isn't some recycled BS - it took me a looong time to learn. Grab a deck of cards and try it yourself!