Board Thread:Questions and Answers/@comment-29476735-20180613100057/@comment-32271305-20180613100923

If you want specific LRs, you'll want to summon on Type banners, like this one.

Otherwise you'll want to summon on Rising Dragon Carnivals (double-rate banners) and Legendary Summons, and avoid banners that guarantee a featured SSR, since that would steal the last slot from a possible LR.