MArcomage

What sort of deck does this card favour? A reason it's unused is because other people might be having as much trouble visualizing that deck as I am.

0-cost?

Decent discarder, almost as good as Samurai.

This card is now completely inbalanced in comparison with Samurai. You can discard two cards from your opponent's hand (lowest cost does not mean much, there are rares that cost less than commons) and Samurai is far more limited/targeted (keyword non-Durable cards).

I think it should be de-buffed by increasing its cost to 7 gems. Otherwise Samurai should be buffed in order to be balanced.

Perhaps it should replace highest and lowest cost cards from opponent's hand with cards of lower rarity. Samurai buff also sounds reasonable.

But that would make the card even more powerful no?

Could be made with modes:

Mode1
Discard lowest cost
Mode2
Discard highest cost

and raise the card cost to 2-3 gems.

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Otherwise if you'd choose to buff Samurai, I could propose one of 3 things:

a. give it Far Sight keyword
b. give it Swift keyword. A Samurai is a master swordsman, so he must be swift right? :)
c. force the opponent to not draw rare.

How about replacing highest and lowest cost cards from opponent's hand with uncommon cards from your deck? I would like this card to have a unique discarding effect.

Who wants to give opponent two uncommon cards?
I think that the card then will be less desired.

Thats exactly the point. It makes the card a build around. When you play the priestess in a zero cost deck, the card is still very good. Elin other decks, Samurai ia better. It would balance things out and would turn moon priestess from just-another-discarder into an interesting card