First free draw in that treasure seems like guaranteed ninja most people just get old 2 star ones so I guess there is a small chance for a new one . Other than that you do need to put in around 60 scrolls for a rare in most treasures anyone who says otherwise either lies or doesn't take into account previous free draws. Kage treasure supposed to have all new ninja in it I think from spoilers w seen even as 10 draw filler.