Henry Shephard noted in a 2008 article on the cult of Dionysus that the word “Magician” is proto-Indo-Iranian…additionally, Greeks referred to Zoroastrians as an ethnic people and the word “Magician” came to mean “any priest, astrologer and magician of non-Greek origin”… 

Shephard claimed that magician stemming from Indo-European magh meaning tall / big (Persian mogh or magi meaing priest) meant “a person having power to perform an action, who is able to do something”…

Given Iranian Zoroastrianism taught that humans are active participants in the cosmic battle of Good vs. Evil by exercising their free will, it is no surprise that the word magician / magi meant a doer of deeds...