I love rumble, and I never see him played. After watching his champion spotlight i decided i really wanted him. Best buy i think i have ever made. My first play with him was very saddening since i hadn't played anyone like him before, but after getting used to him he is almost unbeatable. I can count the number of times i have had more deaths than kills on one hand, and rumble is my main character.

you probably look at my masteries and wonder "what the hell is wrong with this guy?" but trust me they work.

the 9 offense skills give ability power and magic penetration along with the cooldown reduction. Rumble doesn't use mana so the cooldown reduction is amazing, and having such high magic damage output the extra AP and magic pen makes for a deadly combo. also, I master exhaust.

the 15 utility skills are for one thing and one thing alone, move speed. If you can keep them in your flamespitter they don't stand a chance, and when they run you want to keep them in it, even if you cant auto attack. The experience boost is a great bonus as well, allowing you to level faster and increase your damage faster than your opponents.

the 6 defense skills to increase armor and magic resistance are nice and there since rumble is a close range, in-your-face, fighter. taking a little less damage on the way in makes a huge difference.

I take exhaust and flash.

Exhaust allows you to catch up to champions who would otherwise get away as well as dramatically cut damage from AD characters (especially ranged AD characters, who are the most dangerous to face as rumble)

Flash allows you to follow someone else who flashes away, set up better mid fight, or get yourself out of a gank. While scrap shield should usually be more than able to give you the movement to escape anything sometimes you need the extra help.

I take straight armor seals and straight magic resistance glyphs since, as i said before, rumble is a close ranged, in-your-face, fighter and taking the less damage to reach your opponent makes a huge difference.

Magic pen marks go a long way, with the vast majority of your damage being magic the magic pen makes you do a lot more damage.

I am still playing with my quintessences, but on here i have flat ability power quints. Extra damage, especially early game. The other quints that i have been playing with are the flat heath quintessences since you have to be close and you take the extra hit or two on your way in and the extra heath allows you to do that.

Start off with the Doran's ring since it is a great item to start with, extra health and ability power. I know it gives mana per second which is a waste, but i like it.

Next i build straight into the sorcerer's boots. Extra move speed keeps them in your flamespitter and magic pen to do more damage.

Then I get a hextech revolver. Ability power and spell vamp, allowing you to lane longer and level up faster. Later i upgrade this into a will of the ancients, and i will tell you when.

Now I get a rylai's crystal scepter, beginning with the ability power items then the giant's belt. the slow from this item with the aoe from flamespitter or working with the slow from electro-harpoons is very nice. As i said before, keep them in flamespitter, slowing them helps do that.

Now i get a lich's bane. Being a melee attacker you are already close enough to hit them, and when you over heat you hit like a truck anyways, so why not make that first hit a lot harder? the ability power from it is nice, the magic resistance makes it so you can take the extra hit or two you need to get close, and it allows you to hit towers harder. Start with sheen blade (despite the mana) and then go for the ability power then magic resist before finishing the item.

Now i upgrade the hextech revolver into will of the ancients. more ability power and more spell vamp for only 900 gold. Best part is the aura, giving your allies AP and spell vamp too!

At this point you have probably been in some team fights and they realize just how much damage you to everyone at the same time due to all of your aoe, so they start focusing on you. Aegis of the legion helps them from killing you fast enough. extra magic resist, extra armor, extra health, and guess what. More aura benefits for your team, so even if they aren't hitting you your allies still benefit from the extra defense and you all stay alive longer to dish out more damage and kill your enemies!

Lastly I get Rabadon's Deathcap. At this point you have everything you want and it will greatly increase your damage output with the 30% ability power increase. If you need more defense take this slot to get some armor or magic resist since without the deathcap your flamespitter will put out 750 damage anyways.

Max out flame spitter as fast as possible with 1 rank in scrap shield at level 2 and 1 rank in electro-harpoon at level 4. Keep electro-harpoon at level 1 until the end since it is primarily used as a slow and your scrap shield's movement speed gets you into range and flame spitter does as much damage as you need if you keep them in range.

Your ultimate is the best tool you have. Huge range, slow, and a TON of damage. use this to keep your enemies in range and do massive damage (or even kill that tower hugging bugger on the enemy team).