Ruby Jewel
Some Hierophants do operate in insufferably self-aggrandizing ways that spill out from their assumed cloaks of "humble servitude"... The Chosen Ones who speak only the "Right" words and have the only voice really worth listening to, if you have any sense at all (so you'd better listen and heed -- ignoring the observations, doubts, and reasoning of your own silly, "disrespectful" brains -- if you know what's good for you, etc.)...
The medical profession, for example, is one place where they're often found. Also, I've drawn this card to represent an "immoderate moderator" (of an unrelated website) with a penchant for banning those whose personal opinions happened to differ from his own... When this practice was complained about, he'd publicly remind us (the site's admin, really) that he was the only active mod, doing it for free out of the goodness of his heart -- and had plans to make his own competing/"better" site if he were ever replaced.
The Hierophant can be viewed as a potential or actual cult leader, too, just as compelling and misleading as the Devil; I haven't seen that the two cards must appear together/in the same reading for this to occur, though... A sufficiently "swollen", ego and dogma-filled Hierophant can apparently be enough.
That is a good one: the Heirophant as a narcissistic cult leader. Taurus is the Heirophant...as well as a teacher. Narcissism is epidemic in academia.