There was already a Royal Flush gang on Batman Beyond.

But that's where is Darci. That version of Batman Beyond's Royal Flush Gang is basically just a family of aristocrats snobbish and  stuck with beasts out the Ten / Melanie Walker and Ace which is a super strong Android none of the members of this version of the Royal Flush Gang is really relevant . They even become more pathetic than Royal Flush Gang of the comics which are basically a bunch of little thieves cheap. They do not even compare to the Royal Flush Gang reunited by the Joker in the "Wild Cards" episode of Justice League cartoon series made up of meta-humans powerful enough to constitute a threat even to the Justice League . And that's why I thought it would be a much more cooler and challenging a version of the Royal Flush Gang based on those super-powerful characters from Justice League's episode "Wild Cards" than that version of "pampered aristocrats" that Terry McGinnis faced understand ?