Good luck with that. Financial markets are not pRNG's -- they are more like an adversary you are playing poker with. Think game theory, rather than pattern matching.
I was actually considering something known to be a relatively weak pRNG....card shuffling in a casino setting.
Manual or modern automated shuffles in a casino are NOT weak. Casino owners and employees aren’t dumb. They actually understand the math involved quite well.
Casino owners and employees aren’t dumb
Having met a few casino owners, and many more game supervisors actually charged with understanding the math of the games to avoid exploitation, I can tell you this is patently false.