played this build a few times and it can be rather unstable during a game which is not something i usually like

i changed the order so i get zeal before infinity edge so that your not so damn slow at start

at times i would tear through a team and at other times i would get locked out and dropped like a stone even with cleanse

despite this i believe this is one of the better ways to play sion you just need some one else on your team to draw the stuns
+1

greed is useless, you can use that point in sorcery and have the 3%...

i always use this build, no matter what the team is! this works great with any team and my w/l ratio is getting better every day!

Well, lifesteal isn't maxed at 100%, you could get over 100% lifesteal. But 2 phantom dancer is also a good idea, in fact, I put it in the list of any possible sixth item, but my choice is a Bloodthirster.

ADD : Buying Zeal before Infinity Edge could be a good idea if you don't need massive damage.

EDIT : I change my summoners spell but not my masteries, that's why there still a point in ghost.

got a +1 from me

but i suggest using Ghost / flash for sion (especially since you put in a ghost talent)
and possibly even a second phantom dancer, opposing your choice for bloodthirsters since his ulti will give 100% lifesteal anyway

other than the few things i changed when i played AD sion, amazing build

Thank you, nice to see that I'm not the only one who love AD Sion.

EDIT : I'll add some tips for specific situation where it could be harder to fight with that build. As exemple, fighting against Malphite, Olaf, no CC, a lot of CC, etc... I'm working on that, to be sure it will be easy to understand and which specify the most possible situation.

Nice build mate, really nice! :D +1 thumbs from me.