I believe that magicians do have powers - they are great in illusions and deceptions. I do not believe that humans are born with supernatural powers but I do not exclude the magical powers some magicians get from the Devil. Getting back to the main topic, magicians spend years and years to perfect their skill in illusions to make their tricks more believable and realistic.
One cannot claim they are a good magician if their audience can see how they are doing their tricks. So I believe by years of practice, a magician can be powerful in deceiving people that they do really have supernatural powers and their illusions are real and out of this world.