Board Thread:Questions and Answers/@comment-26239302-20150324074007/@comment-24965906-20150324101025

Yes, any attribute that contains the entire word "Dragon" in some form, whether Armordragon, Duel Dragon, Dragon Lord, Dragon Knight, Black Dragon etc. So you were correct.

A good rule of thumb is that if you can put that monster in Dragon Ein, then you can kill it with Balmung-like Anti-Dragon cards.