The ability to alter probability, allowing one to make the unlikely more likely to occur, and vice versa.
This can take effect in a variety of different ways; it may appear as just supernatural luck, or can be more actively used for defense to make attacks inexplicably miss - and in the same way, it can be used to make sure attacks always hit. At a high level, it can be used to make things that would be completely impossible otherwise certainties. Due to the many potential applications of such an ability, it is exceptionally versatile and its capabilities should be judged on a case by case basis. On a greater scale, it can be used to manipulate quantum probability and can reach the level of powerful Reality Warping.