The wording is about the same as Zadok Anoints Solomon (If used by a Tabernacle Priest, search deck for an O.T. good card with a brigade other than teal), which leads me to believe that Hypocrite's Proselyte could be played, even by an Emperor that isn't grey brigade. The wording is distinctly different from other cards with this sort of situation (the main one is escaping me right now).