I think this could be something they could do to keep Hearthstone fans interested and make the game refreshing.
I don't know much about WOW lore so these probably won't make sense, for example:
Mage: If you have spells of only one spell school in your deck your spells gain an additional effect exclusive to that spell school
Priest: Exclusive cards for Shadow priest only, Exclusive cards for Holy Priest only
Druid: Hero power evolves over the course of the game
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