Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is basically an AP build
This AP build has an Touch of hybride (hextech unblade)
becauze you can get squishy and also to boost youre AD with it with for youre passive.
At the begining of the game you'll usually need an doran's shield
after that you'l need more HP but first you need to be ABLE to run away, so just urchasee 1 boot and then go for rylai's crystal scepter, after you got youre Health/Ap item you want to finish youre boot so sorcere's boots go really well with AP item's
for Sheen/Lich bane ---> his passive is REALLY good for Rumble cuz when you have alot of AP and when you 'overheat' you can deal significant damage
When youre Electro-Harpoon doesn't connect you can always use Exhaust,
and it also is very usefull when you use it and then take youre opponent down with flamespitter/overheat and deal alot of DMG
when you use that you'll need youre shield, because you'll be vunerable,
so be sure to use youre shield just BEFORE you overheat
Also if you overheat and youre shield is already broken and you are being ganked, that's basically when you use Ghost.