Well. While sleight of hand is a key tool in magic, traditionally confederates and even camera tricks have been too. David Blaine's famous levitation trick, for instance, looks so impressive on TV because they cheated and made it look more impressive than it is.

Mentalism as a magic power is not a real thing, sorry. It is a title magician's sometimes took and take to make their act look different. http://simonsingh.net/media/articles/maths-and-science/spectacular-psychology-or-silly-psycho-babble/ Simon Singh on some of the tricks. http://www.secrets-explained.com/derren-brown has a list of some of the tricks he performs as well.