I guess you could be right, but then again, not even looking at the prices, that I already experinced with 2 of them, didn't get me any battles passed through. haha.
All in all if the cards were useful but the price was hardly any I wouldn't mind though. But this is pretty shitty result for the revealings to be honest.
only the recent 2 quests I got more mana in total and when it comes to Life quests, most of the time I got like 12 - 16 mana in total; so every card has to count in both affordable (in mana) and also well used.