User blog comment:Linathan/Unit Spotlight: Metal Mimic/@comment-26336535-20150507013709

I have problems with spirits, others have problems with Metal mimics.

evidence:

I get like 3 spirits per evolutionary paradise run (I do that dungeon because I've encountered a total of 10 spirits in quest and captured 4), and they're usually the wrong element. Time to grind for spirits to evolve: approximately 3-4 days

I always have one metal mimic, and get 1 every one or two weeks from the Wednesday dungeon. I currently have 7 of them. Time to grind for Metal Mimics: hit Evolve

As a side note you could let the mimic die and revive him on the turn you use all those buffs.