This is the 8212th most frequent Russian word.
магой
"Magoy" (магой) is a form of the word "маг," meaning "magus" or "wizard."
Here, 'магой' is used in the instrumental case to describe someone who possesses a quality or capability emphasized by the context.
Этот мудрый магой научил меня многим древним знаниям.
This wise magician taught me many ancient knowledge.
In this sentence, 'магой' clarifies the role the subject is recognized for, emphasizing the excellence in their field.
Он был известен как магой, владеющий искусством иллюзий.
He was known as a magician proficient in the art of illusions.
The usage of 'магой' here is to depict interaction with a beneficial character, framed in an instrumental functional role.