User blog comment:Gyoretsu/Limit Breaker mechanics?/@comment-26432452-20190105075758/@comment-26432452-20190105105018

Well for me personally, it's not that hard to hoard that spheres.

First of all, you could get 10s of spheres from the monthly Chronicle tower, on the Night/Dark side one. Then cek your tavern gachas. I think you could have a free 10+1 on all tavern every once in a while (don't know the timing honestly). The SSR rate on Book 1 and Book 2 tavern is 10% I think so you could get lots of junk SSR that you could sell for spheres. Also I usually sell the extra copy of SSR that I got, only rarely LB-ing the cards that I like or the one that benefits from LB.

So as you can see, I could hoard lots of sphere that way. Still have 20s spheres after I bought a LB card for Rivera, gonna try to LB her more after this. :p