Stigmata has been pased off as being "Mentalism" but in truth, it falls into the Bizarre Magick ben which, unfortunately, has gotten blended in with Mentalism for several logical reasons (the two deal with odd phenomena, the surreal, etc.) Secondly, Stigmata tends to be a Card Trick for most and on that front, the public perception seems to fall quickly on the "believability" scale simply because modern audiences will be suspicious of anything using a playing card... they will see it as a "trick" vs. a miracle 85-95% of the time (though most performers tell themselves different).
If you really want to blow people away as a Psychic Entertainer (which is what Mentalism originally was, by the way), walk into a coffee shop and start doing Muscle Reading demonstrations in combination with Psychometry Readings of personal articles (the connection works very well)... then, as a kicker, either find a hidden set of keys using Muscle Reading or let the gathered group challenge you by jotting out a list of things you must do physically... put the slips into a bowl or some such, have one drawn... the information shared with group members as to what it is you are to do and you're off to the races...
... I can assure you, this is going to take your reputation much further than any card trick you are likely to come across... including the $1,000.00 card tricks on the market.