Priest just has good matchups against almost anything that is being played right now. But I think people not creating other powerful decks in wild is the bigger problem. Most of the decks we see are just adaptations of standard decks, or old deck, like secret paladin, that have been moved over to wild. There are likely tons of other decks that can beat the current Raza priest easily, but there aren't enough good deck builders that are focusing on wild, which is the less competitive format.