Nereis is actually pretty good, I've seen her used effectively in files before. The odds of her ability backfiring should be incredibly slim, the conditional for the + range requires your opponent to have more units than you, and the ability let's you choose who to return (for only 1 sp I might add). And once you have 10 grims + played, lowering it by 3 doesn't really affect your units' damage output all that much (With 7 grims played, most of the other units are dealing 70 damage or so). She also has a nice pinpoint ability that's not dependent on range, so even if your opponent doesn't have more units than you she can still attack. Not to mention all the possible combo possibilities she has. Her SS is also pretty good.
Also LOL at the adult Nereis. Seems the alteil character trend even affected her XD



