Champion of the Pit

I own a lvl2 Champion of the Pit Should I spin for it's increased chance event and take it to level 3? Is it worth it? Also I am thinking about spinning there for the marathon So, is Cotp worth it, or should I spin in the regular section and hope for some other spehers? As V also need to spend faction coins to complete the marathon ( I want those sexy gemss😭😭) Pls guide Other sets I own: (will I lucky enough to get spheres?) Lvl3 : Divine Judge Lvl2: Abdicator, Warmonger, Shadow Artisan, Cotp, Arrow, Living legend, TN, Usurper, Anomaly Hunter Lvl1: Void Warden, Fucker kamal, etc etc