There may come a time when such changes will become necessary, but atm, things are pretty balanced.
We've had these heroes for quite some time now. Zhanna has never really been consider weak from what I can tell. Jericho is on the weaker side, I'll grant you that, but its not like he's without his own set of strengths and good match ups (not to mention, Jericho's ability can definitely improve as the card pool gets bigger and things like Negative Effects/Attachments become more prevalent with every hero/class). I'm not quite sure where this urgency for change your asking for is coming from either, these heroes still do quite fine with the ability they've had for well over a year now. If priests were really that bad off, I'm sure the community would have stated so by now.
Anyways, I recommend you give priest a real try, learn more about them, then come back and revisit this. The fact that you don't play them may contribute to why you don't get the strength of their abilities and card pool. Just like when a player feels a class is too strong, playing them can help you understand them better on not only how to beat them, but how to play as them as well.
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