Bloodthirster and Vladimir

+gunblade too

I mean, in the sense that he has an autoattack that benefits from attack damage, yes?

why....

The answer is yes but the question is why? Vlad has low attack speed, low base ad, and an awful attack animation. Vlad also does not have an auto attack steroid of any kind. You can get some very small bonus healing off every now and then with a bloodthirster and a possible shield from the passive if you can hit minions a bunch before fighting. But without crit, attack speed, and/or more ad you really lose a decent amount of the power which bloodthirster inherently brings to marksmen. I'd honestly recommend going for more ap, cdr, pen, health, or even armor/mr than to just throw in a bloodthirster. I'm not telling you can't do it; I'm just advising against it in an ap build. But if you want to run ad vladimir then follow your dreams.

yup, you should be building those every game.