It is not sure if there is only one, or there are several. Certain is, the creature moves freely in the lands of mortals. Luckily, she is rather benign, maybe not even a demon, but some sort of a malevolent spirit instead… whatever the difference is.
Whatever its shape, it is always a humanoid female of exotic beauty. Frequenting casinos and various gaming locales, she does not seem to want to draw too much attention… but her noble ways, the fine clothes, jewelry and faithful servants betray she is one of the higher classes of society.
Wealthy and mysterious, enjoying the sight of people gambling, she sure does attract the attention of lowest gamblers and nobles alike, and many invite her for a game or two. She refuses most of the offers, saying she only plays for the fun and in friendship. But if it is a friendly game, without money or with low bets only, she will play, and she will win MOST of the games, sometimes with very rare combinations. She does not win all games, but wins enough to make any gamer jealous, and accepts all losses like a true lady.
Evading most private questions with indirect answers, most end up considering her a wife of some wealthy merchant or noble, staying bored at home while her husband always being away for business. And so she stalks the casinos, playing the games a little, and looking at interesting games… side note: she brings luck to those she favours.
If there is friendship between her and a gambler, she will play with him, and sooner or later will a fool insist on playing with at least "imagined" money, to see how it would end up. Winning most games easily, the imagined debts rise to great heights. Soon, all the time in good humour, she would start betting the personal features of the unlucky courtier… "A thousand gold for your charming ways… two thousand for your courtship… five thousand for your hope that never ends" and so on.
Until some day, the gambler is completely indebted with those seemingly meaningless debts, belonging to her with soul and body like the other servants, becoming a slave and personal property. Then perhaps, she will move on to another city, to seek new games and new entertainment, and maybe new servants.
Side note: Sadah is from the Arabic for fortune, but she would of course use many different names over time