User blog comment:Deshiba/The Ghostcleaver/@comment-5209745-20140314122506/@comment-4022742-20140316124135

Note that the champions I mentioned specifically are those that have built in attack speed boosts. They also have generally higher movement speed then the average Marksmen. So what they might loose from not having, , or  gets compensated in damage output with the extra penetration and additional cool down reduction.

has her and, which with 40% CDR reach a higher DPS value then just having a PD or TF, because the extra aspd + at reset have a higher frequency. Taking in account that your is available every minute instead of every 100 second and thus is probably available every teamfight in late game, I don't see why MF wouldn't benefit from this build.

has her which in combination with her  increases her attack speed to 80% for 3 attacks. Having that skill be on 3.6 second cool down means that you pretty much have ~56% aspd boost under your thumb. Add to that the effect of having your entire team move 20% faster for 8 seconds every 48 seconds instead of every 80 seconds, your utility will increase significantly.

is juist a champ at this, with his and  naturally increasing any statistic a Marksmen could need! Adding Youmuu's to that mix shouldn't be that far off as it increases his base stats more consistently then people that take on him. With the active that the YG provides his burst gets complemented even more.

In fact when I look at these champions specifically, you will want the critical strike, ad, armor penetration and cooldown reduction. As for the active, that's just nice on them for reaching near Max Attack speed and some extra movement speed.