I hear what you are saying, but at the start of the routine the "newness" of the deck is a positive feature. You can talk about many different card systems have been used in the past for psychic research....but now, finally a nice clean card that is made black on one side to ensure once and for all that no one can see through the paper. " etc etc
I think a psychic, mind synchronising patter is best. Say that you have been practicing, but some of the guesses might be wrong etc. Even deliberately mis-read to make it seem plausible.
One of the routines, it would seem that the spectator predicted YOUR card !! Thats a great one for implying that with a bit of concentration we all have abilities
