you can easily pick up a 2 star iruka for most of the things hes good for ie exams and ninetails from just refine and work on getting him upgraded over time. i bought 3 star wind blade in one of the first lucky stars events and since then ive just gotten fragments from survival and am almost 5 star with him so u might just want to wait on getting him. Sage is guaranteed to pull with 120ish seals in the sage treasure. If u feel pvp is where u are lacking Iruka and Sage are equally a good choice in defense and offense. WB is niche for pvp teams as he really is only good if u can maintain his buff.