Do you know a little bit about Tarot? My character would have to be the one to explain it as it can get rather complicated in a way. What I'd be meaning is that, a normal person would take a tarot card and draw it, nothing would happen. My character would draw a card from the deck, and the person she would wish it's use on would be the target of the ability that card draws upon. I actually know Tarot reading, so I can have each ability based around each card and it's meaning. Example would be the X of Swords. If she drew it in the upright position, the person would experience a loss of some kind, ill fortune which isn't deadly but damaging in someway, but if she draws the X of Swords in the upside down position, would kill someone. Not all Tarot cards are negative really, but the Reversed X of Swords is one of the worst ones to get when doing a reading sometimes.