You know the skins that you can't buy despite owning everyother one of that champion skins?

when I started playing LoL a few months back I completely fell for Sona so much that I mained her and always managed to pull my teammates out of trouble (If I got there fast enough) However this is not the point im trying to make. When I started maining Sona I thought "You know what? fug it" Then I bought Arcade Sona and not too long after that I bought DJ Sona the Guqin Sona than Pentakill Sona and the day it came out Sweetheart Sona. But you know what? I was new to League so there were two skins I didnt have.... Her legacy skins, and i thought "But rito I love her pls dramatically wipes tear from eye" but Rito abandoned me The only hope I have of buying the two legacy skins are with hextech chests. Common Rito ive already spent over $300 on you and id spend more if those two damn legacy skins were available to me, Rito pls Halp!