I guess under the conditions listed, my first one was the Jones Change followed by my own A51 base false cut (u can use it and modify it to make some good stuff).
Fluid now has about 5 variations and can be done about 20 times faster. I have a new one I call branch that I am working on and as soon as it is fast and smooth I will post it as well.
I think I started with the Swivel Cut, but that doesn't really count... 'actual' flourish, I would say Sybil. I tried Eko with little success, but Sybil I got down rather quickly. In my opinion, Sybil should be one of the first cuts learned by any new cardist.