>>533788721
Non-limited 6* ops and 5* ops rotate in the shop, with the former being 180 certs and the latter 45. You can save up and buy ones you like. Alternatively, you can purchase headhunting permits (the gacha tickets). Every month there are 38 rolls worth of permits in the cert shop for a hefty 258 gold certs. It's a pretty substantial number considering how scarce our gacha currency is, but you'll have to pick and choose between them and operators who roll around. Grats on the Chernobog full clear!