Board Thread:Event Discussion/@comment-11458028-20140819113145/@comment-24990818-20140824165935

If by efficiency you are referring to the EXP per silver, then Diamond fused to Hare of Inaba would gove you the most bang for your buck.

Hare of Inaba magatamas are for increasing her skill level, but are still very cost-efficient as well.

Honestly I don't really care about silver efficiency though, it's not as big a thing in AGG. If you are referring to attack efficiency then that's something else altogether.