Talk:Transformation Boost/@comment-31550106-20181022002036/@comment-32271305-20181022015721

They included all of the villains who are able to transform (and all of their cards, from their base form to their final form), but only a couple Saiyan cards made it into the Category.

It's a bit weird but it makes sense that they wanted to avoid adding every single Super Saiyan, except for the ones who have an in-game transformation mechanic, otherwise Buu's Leader Skill could have been simply for "all Types".