Magic Forums

So I understand that spirit boards can have negative things come out of them, that there's an element of "danger" (for lack of better words). The woman I'm kinda learning from at my local Wicca store has also warned me that crystal balls, while not as intensely, can have negativity come through them. I've heard nothing of the sort about tarot cards, per say. Are there any other divination methods that I would need to "worry" (again, lack of better words) about?