I've only just implanted these cards in my and one of my players that is more of a power gamer and still trying to rp more used the "What are the odds" (this card makes the targets roll a natural 20) card to have an npc who was trying to remember plot related villain rants that this lich had told her before smashing his head years ago thus allowing them to know his plan.
That was mostly awesome because of the players use of it but the fact that these cards can allow something like that to happen is most excellent IMHO.
I am currently setting up for a non-magic game and this book is just what I need to spice up the items my PCs can acquire and make the world as fantastic as a magic one without being one itself.
