Helms of Opposite Alignment and Decks of Many thing are campaign derailing cursed items that are primarily "gotcha" items for the arsenals of vindictive DMs or traps for the ignorant.
I just have to disagree a tiny bit on this comparision. A helm of OA will burn a PC who has not done anything wrong. A deck however, is known to have inherant risks, and very bad cards, and if you are greedy enough to take the risk, you deserve what you get.