FYI I'm contemplating scraping the matrix force as my finale in favour of one of the magazine or newspaper tests in Practical Mental Magic. Two of these really stood out to me and as one uses an add a number principle to decide a page I don't think another adding number game will work. The only down side to this is while it will have very direct powerful mind reading it won't allow me to set up my climax at the start of the show like a prediction would.
It can do if you add a simple nuance, there are many ways to make it appear as though you have predicted the show before hand I.e you hand the envelope out at the start of the show that says prediction, (you then take a smaller penny/pay envelope out and show the audience) everyone in the audience is asked to guess a 2 digit number (that is sealed in the pay envelope you have in your hand) the person who gets closest to the number (e.g one off) is the one that will come and help you with the headline prediction.
(we will say its a woman in a black flowery dress, smart looking wearing a set of bangles.)
The end of the show comes that person comes up you perform the headline stunt then....the envelope that was handed out at the start of the show is opened and inside the it reads,
'I predict that tonights show the person who gets closest to the number that was sealed in the envelope at the start of the show will be a female, well dressed in a dark colored garment, will have a liking for flowers, lots of jewelry for example necklaces or bangles and if my skills are well homed be one of the number i intended her to guess.
She will come onto the stage on (date here) and (fill in what headline she will select from the paper)
not only have you predicted the person that would guess closest to the number you had in a sealed envelope you predicted she would stop on a certain envelope