Board Thread:Questions and Answers/@comment-26361493-20150501185927/@comment-26021614-20150501222332

Well it depends on what other units you have; the units in your team are generally pretty weak compared to the newer ones, many of which will give you a 50+% boost in ATK without needing 5 elements or more, or many of which will give you more than just an ATK boost.

Furthermore, try not to focus on just having an ATK boost. BB and SBB is where you will get the most power in your moves, so you really want to make sure those power up quickly. For those, Elza or Zelnite will allow you to use SBB practically every turn. Other units that help with this are Kuda, Orna, Shera, Miku, Kira, Alma, etc. It all depends on what support units you have in your team.