[quote=Keyblade87]
Just for the sake of argument isn't Dark Magic Attack a support card for Dark Magician?
[/quote]

It is a support for Dark magician specifically, not "Dark Magician" monsters. 

It turns out I was wrong about Dark Magician not being an archetype though. It just got it's first support card in "The Eye of Timaeus", so it is now its own archetype. :toot