Use Flamespitter to zone out your enemies in lane with AOE magic damage.
Scrap Shield is good to activate before you initiate on an enemy.
Spamming Flamespitter and Electro Harpoon is a good harassment strategy, but be careful not to overheat or you'll get silenced.
LoL Rumble players will likely find him to be a complex champ to build out properly. You will find that his build varies when he is playing against either generic or homogenous team comps, indicating you shouldn't choose the same Rumble build every single round of League of Legends
The most essential items to include in your champ's build are: Hextech Rocketbelt, Void Staff, and Demonic Embrace. Players who added these items in their gear had a higher win rate than those who tried for other builds for Rumble. Likewise, if you are playing a well-mixed enemy team comp, you should really consider grabbing him the Sorcery, and Resolve runes. In recent matches, he won the greatest fraction of his games when equipped with these runes.
We set our Rumble build guidance by analyzing 23,509 recently ranked League of Legends rounds with him in them. We only advise the highest winrate Rumble builds that were used by ranked LoL players enough times for us to suggest them. With so many rounds in our data, we are quite confident in our suggested builds.