Board Thread:Questions and Answers/@comment-26805959-20150722043810/@comment-26297531-20150723065317

it is possible.

Narza lead is your 1st criteria. Narza's LS is 50% faster BB fill rate, and his 6 stars SBB grant you BB regen on hit (and status immunity to boot).

As for the rest, put together units with high drop checks / hit counts. Tridon and Selena are good. Shida is useful for his all elements buff and 8-10 bc fill on cast (sustain bb gauge momentum). Michele will be getting 7s soon, so it's gd to round off with her, and she adds +atk too.