Aatrox+Sated Devourer=LOVE!
So I've had the wonderful experience of wielding a fully stacked Sated devourer on Aatrox, and let me tell you; being able to proc my W every second auto attack instead of on every THIRD auto attack makes him feel complete. Items change over time however, and I get the feeling Sated will be nerfed or altered in the future so enjoy this while it lasts my fellow Darkin.
Often times I have felt that Aatrox's ultimate was pretty subpar. I think a really cool buff to Aatrox would be to give him the Sated Devourer double on hit proc when he casts his ultimate massacre. It fits his theme, his character, his kit and actually gives him a meaningful power spike when he casts ultimate. Other things can be removed from the ultimate for balance purposes.
On paper one would think Attack Speed would be sufficient enough to proc w often but the reality is there is just way too much counterplay to AS in the game right now with AS reduction, crowd control, kiting, and peeling. AAtroxs sticking power is pretty subpar too. Your gap closer is easily interrupted/easily dodged/and ridiculously telegraphed. Your ranged slow often isn't enough to close the distance fast enough to re-engage a carry with a dedicated tank/support peeling for them.
The double proc ability would make AAtrox's sustain and damage much more reliable in a duel and a teamfight.
In short the buff to his ultimate would read: "Every second auto attack triggers Aatrox's on-hit effects twice."