It's a very cool item to use if you know what you are doing, because everyone knows it.
My players had to get something from a djinn merchant in the city of brass. Said merchant wouldn't sell the item to them until they had bought had least one draw each from the deck he possessed. Draws were 1000 GP each.
I had toned down some of the beneficial results. And the djinn merchant was able (for a price, of course) to remove all of the bad results. So the whole thing ended up taking lots of GPs from my players, which was my plan, since I had realized they had too much for their level. But they never knew I did it for that purpose, and, in fact, were quite happy to have gotten away "so lightly".
My players had to get something from a djinn merchant in the city of brass. Said merchant wouldn't sell the item to them until they had bought had least one draw each from the deck he possessed. Draws were 1000 GP each.
I had toned down some of the beneficial results. And the djinn merchant was able (for a price, of course) to remove all of the bad results. So the whole thing ended up taking lots of GPs from my players, which was my plan, since I had realized they had too much for their level. But they never knew I did it for that purpose, and, in fact, were quite happy to have gotten away "so lightly".