I don't think people realize just how bonkers this card is. They have so many cheap spells, and synergies with such.
The instant, and obvious comparison is to that of Raza priest. But the thing is, Raza priest required highlander build-around. Hunter quest virtually does not. Another thing is, you have this effect in Hunter, a class that has reach through spells in addition to it just being Hunter.
The quest allows hunter to just pack their deck with low cost spells/minions, while retaining a wincon against slower decks.
Buckle in folks, this is the card to watch for.
Nobody is underrating that Quest, when it's the obvious candidate to get nerfed first out of all Quests.