No, Magus isn't a playable character in CC. Janusmight be one of the characters. It's rumored that Guile is the alternate reality version of Janus (Guile being the lighter side and Magus being the darker side) but there is no proof of it. When I say "Magus" I mean the dark wizard from CT.
Originally, Guile was actually supposed to be Magus in disguise. In Radical Dreamers, he was. They cut that out because he doesn't have enough character development in CC.
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