User blog comment:Care Level/Fucking Sightstone, Man./@comment-24564937-20140422035035/@comment-9593635-20140422043953

The damage certainly wouldn't have a 100% AD/AP ratio; something closer to, say, 1% or 2% per second would be more reasonable (so maybe 20 or 40 damage per second with a full team; not a ton, but enough to make a difference). "Based on" does not mean "equal to".

Also, as far as the cooldowns go, I agree; below, I talked about splitting the active into a no-cooldown active that just drops a ward, and a 60-ish cooldown passive that changes the next ward into a Standard (teamfight active).