Talk:Unit Collection Event Guide/@comment-34581719-20190716212017/@comment-4339465-20190716233027

While I cannot answer with absolute certainty, it does seem to be RNG, yes. The colors don't seem to be coordinated with anything in particular. It does, however, seem to be a common problem of people not having enough of one color, so you're not alone in this, though I'm not personally having an issue as mine are more balanced.