Seems like a fun card. Probably doesn't need to be TC or multi-brigade though. Would make the most sense to just be evil gold in my opinion, especially cuz then I can run 4 in Type 2.
I'm also unsure if it would really merit having a Star ability, but Abimelech, King of Gerar got one, so it could happen.
Was 5/6 just something you came up with or is there a thematic reason for those numbers? AFAIK, there's no conclusive evidence from the Bible regarding how long Joseph was in prison other than it was between him being sold at 17 and becoming second to Pharaoh at 30, so maybe the numbers could be 1/3 to signify the technically maximum (though unlikely) 13 years Joseph could have spent imprisoned.