Castleton signed a two-way contract with the Magic on Wednesday, Paul Garcia of The Spot Up Shot reports.
Castleton will return to Orlando after operating as a two-way player for the club last season. The 26-year-old big man appeared in just four regular-season games for the parent club and missed significant time with a fractured right hand. He figures to see the majority of his playing time with Orlando's G League affiliate, the Osceola Magic.