There are tons of cards which are overly overpowered, AND there are a bunch of poinless cards .. mend a pet? heal 1 hp is worth.. 0.25 mana maybe restricted to a beast.. less than 0 mana..
Overall the cards don't fit any theme like most adventures,classes have legendaries (multiple?) and every class have too many cards for an adventure.. if anything it's an expasion and the amount of legendaries is too high..
Will point out the real broken/pointless cards the rest are fine
Aggressive trainee 16 damage 3 cards.. 7 mana (* 2 + whirlwind, or just a death's bite..) patron anyone? aso windfury is a shaman thing.
Hyjal Warrior: pointless card.. doesn't fit warrior too wisps are a druid thing too.
Dragon destroyer: betterFlamestrike with a minor drawback the effect is worth at least 10 mana..
Xal atoh: too op.. with magma rager it's a 12 mana burst with 2 cards.. or just berserker like patron warrior..
IN short charge is bad.
Black hand, or effect which means at random.. those 2 effects are unrelated one is offensive the other defensive.. it's weird..
ok I don't have time to review all so..
Spitful tree.. hhmm core hound or captured jourgamaunt.. both aren't played..
tyrande which kind of cards?
shadow hand overprice should cost 2 like Lava Shock
exorcism.. seriously.. if demons were in every deck.. flavour wise it's nice balance it's like.. "f*ck you spellslinger" and any RNG mode (tavern brawls) for priest this card is the most useless card ever XD.
the "or" effects aren't really consistant the 2 options aren't even on the same level and the RNG variance is too high..