Talk:Sheen/@comment-76.92.184.123-20120506040207/@comment-209.89.45.175-20120507224829

That would count as a passive toggle, so it would not proc Sheen. The difference is that abilities such as Nidalee's Cougar Form and Swain's Ravenous Flock have an immedate effect - such as transforming the champion - and a cooldown, while abilities such as Frost Shot do not. The line is a bit blurred for abilities like Blood Scent, though, since that does have a cooldown but does not proc Sheen according to this article (though I haven't tested it myself).