I have noticed that a lot of peeps use runes to add just attach speed to this champ, in total they get in the range of 25% +. i reckon if you buy your items purely for attach speed, runes will provide an improvement of maybe 10%, not much considering that it is all your rune slots. now if you add life steal, with these items you get a 22% increase overall from your dude. Not bad for only 3 rune slots. I've also seen guys, with only attach speed gear, this gear usually brings attached speed up to 100 to 110, with the 9 runes that i'm using here you'll get a 20% increase compared to a champ that has only attach speed gear. Total, off 12 runes placed as mentioned above, you can probably improve this champ by 42% and have 18 rune slots left over.