weeeeelllllll... torn is difficult in the actual performance, I mean holding those dang pieces aligned can be quite tough.
Exposure?
I found Torn to be pretty easy with a bit of practice.
And yeah you can only change to the card your gimmick is and you can only make your gimmick as a court card or if you don't mind the construction of your gimmick getting more complicated then I think you could do it with any card.