Nothing can replace the BRM stuff (those are the core of most of the dragon based decks), but Dark Cultist can be replaced by velen's chosen, or whatever you want. As for not having basic priest cards, just level up by either playing arena, building a basic deck and playing ranked or unranked, or grind against the AI in solo mode.
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You must be mistaken on the turn that happened, his hero power costs 4, and he doesn't start with extra mana like some of the other bosses.
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.... can't tell if troll or serious, the suggestion is for the wrong class.
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Nothing can replace the BRM stuff (those are the core of most of the dragon based decks), but Dark Cultist can be replaced by velen's chosen, or whatever you want. As for not having basic priest cards, just level up by either playing arena, building a basic deck and playing ranked or unranked, or grind against the AI in solo mode.