The unupped would be a tad awkward in monos, duos, etc. "Yeah, I'm going to summon a nymph! Oh damn, it's a gravity nymph and I can't afford it's black hole. >.<"
More of a rainbow card, whereas upped fits almost any stall deck involving water
I think it's got a reasonable cost too, assuming you MUST have 10 uanta in reserve to use it.