Best case scenario as a 6 mana 4/4 destroy a minion is actually insane. Vilespine slayer saw play in nearly every rogue deck until it rotated and this is comparable to that, this could be the cornerstone to a not resurrect priest deck
Unless the other 3-4 Priest cards are really busted that somehow require this, there is no way this sees play until the April rotation.
It doesn't fit Ress Priest (which is already bad) and also doesn't fit Combo. There's no dragon sinergy (so far) whatsoever to justify running this, specially since single target removal isn't a problem for Priest right now.