Royal Flush

"Heh, no one has lost to me before, and you're not going to be the first one to win against me."
A dragon who got their riches from playing at casinos very often. Not only that, they seem to always had an advantage over everyone else due to their royal lineage. Very smug & pretentious, they love to prove to people around them that they cannot lose, no matter what. And, if they do lose? Well, let's just pretend it never happened, shall we?