--NOTICE: MOVE YOUR MOUSE ONTO THE "note" button besides item builds so you can see my insightful comments Kappa, oops caps!--
Heya my in game name is Yuumifishing, previous known as Sighstone Buyer but since sightstone got removed some seasons ago the name didn't make sense anymore so I changed it! :)
Anyway I'm currently Diamond IV in Solo/Duo on NA server with 67% winrate over 60 games playing mainly supports, and Platinum III in flex playing other roles and champions I'm not good at.
I've played so much ARAMs that I think I spent most of my time on Howling Abyss instead of summoner's rift. Currently having more than 3000 games in ARAM with 55% win rate and 2500 MMR (top 0.8%). I like to create innovative builds and test them out in ARAM, some of them works while some of them don't. When they don't it's oopsiedaisy and boom my team flames me for that (But generally I don't care unless they get very personal in which case I'll just report them ;o )

There's certain advantages and disadvantages for every build since League of Legends is a relatively balanced game (Sona cough cough Nautilus) so here are the pros and cons of my build:

Pros: INSANE poke with perma slow late game (which allows you to land W after W on the same target and tilts the enemy team), very good utility mostly, and more frequent situational CC as you have more traps than usual. Frightening pick potential with you R as it does SO MUCH DMG and is on a very low cooldown thanks to your CDR oriented build. Also allows you to turn your Q one permanently and spam rockets as you have such a huge mana pool + clarity. Decent auto attack damage after you fully stack your Manamune into Muramana.

Cons: Low sustained damage. Low damage to tanks. Low damage if you don't land your abilities.

Although there're pros and cons I personally think this build is OP in aram so no this is not a clickbait :^)

Basically you want to spam your W on cooldown onto champions for pokes, and spam rockets onto minions as you want to stack up your tear fast and rockets only cost 20 mana each, also to push the wave. (Cuz if you are pushed under turret you can't poke as much). When a teamfight is initiated stay at your max range and hit the closest target with rockets and Ws followed by R. If you get excited you can overextend a bit and hit low health enemies or squishies who are further behind enemy lines. Throw your E into the enemy formation and trust me they will mostly be dumb enough to stay into it, granting you some guaranteed-to-land poke with W and rockets. Use R whenever you see an enemy is low -- you don't have to kill them from it just poke them so your team can get the kill later.
Also, since you get the bonus attack range from your rockets you can spam rockets onto enemy turret from a safe distance during siege which is very neat!

CYA!