User blog comment:TheTobarMethod/A New View On ADC's IMO/@comment-98.246.3.43-20130211054252/@comment-4118289-20130211202829

I think you are conflicted on using "caster" as a term between "uses abilities to deal damage" and "uses abilities to increase damage output in other ways". By all definitions I've crossed with, "caster" is defined as first one, hence "AP casters". True, Vayne, like Draven, does use her abilities often and is suggested to use them in such a way, but they don't do anything (besides their small utility) if they aren't paired with autoattacks. Ezreal and Corki, and to a lesser extent Varus and Caitlyn, however, can simply whittle you down, and eventually kill you, using their abilities alone. That's probably the thing other poster were trying to prove.