The phrase "great magician" refers to someone who has extraordinary skills and abilities in performing magic tricks and illusions. This person can amaze and awe others with their magical talents. Full definition
God is the Great Physician, not the Great Magician. (nakedpastor.com)
To the great magician or to the One who for our sakes became poor, weak and mortal, even to death upon the cross? (religion-online.org)
Perhaps fittingly, Conan Doyle's fame brought him into company with the greatest magician of his age, Harry Houdini, who did not suffer fakes gladly. (scientificamerican.com)