When you get stuck in a gloomy dark abyss for a couple of centuries, you begin to get bored. When you get bored, you begin to hang out with demon horses and eldritch abominations. When you hang out with demon horses and eldritch abominations, you pick up their habits. One of such habits is gambling. And for Sombra, he's finally winning for once. But when you start winning, you begin to run out of luck sooner or later, and when you do, the consequences are… not favorable.

For Sombra's sake, he's just hoping to keep his knees in working order by the end of this.