I've never had much luck in any gamble/gacha based game. However, today I decided to start using up those Shards (SP base summon) because I don't think they're used for anything (right?). Had 51, kept rolling, got mostly trash, then a Assal, more trash, then an Alissa, more trash, and then Theif Leda. Have 21 shards left. I don't know if I should use them. (I didn't want to use SC because I wanted to save to have 10 in order to roll twice on premium for Leda, turns out, I wont have to spend any at all due to SP base summon).