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.
Welcome! It's my first build.
I have seen many players that playes with rumble as a tank. This is wrong way. Have seen many players that couldn't play with rumble even when buying proper items. In this guide you will see the only appropriate build which is AP build. You can of course think that this is the worst build you have ever seen, but first try it than judge it.
I can't tell you which runes you should take, cause I am only lvl 20 and I'm not interested in runes yet. I think AP runes and magic penetration will be best. You can take 3, 4 runes with HP too so you will get better survavibility.
I showed exemplary mastery tree that you can use or not. Masteries choice depends on your will to use ignite. If you want to use ignite spell in place of flash/ghost, you must change your masteries tree.
As you can see, first item is Mejai's Soulstealer. You must buy it, because you will be killing much. Every piece of additional AP counts. But if you are not doing well, you can sell it and buy Rylai's Sceptre first.
Why not Rylai's Sceptre first to buy? It's simple. If you played few games with Rumble, you won't need much hp. Much AP is better, because you are killing enemies faster. Remember to not solo 3 or more enemies, because that will end with your death prolly.
There are many possibilites. You can choose between flash, ingite, ghost and exhaust. In my opinion flash+ignite works best, escpecially in early game. Ghost is good alternative to flash or even 2nd spell that you choose with flash.
That's the full guide. I know that not many people is reading guides, they only look at items sequence so in my guide you won't find much text. I hope you'll like it. Leave your opinions in comments. Have fun with Rumble!