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.
Ok, so I don't really know who read this **** since you just need to look at the items, runes, masteries and the skill sequence to have a fairly sweet Teemo / LeBlanc / Dr.Mundo, but I have to write a 300 character build description to get a ''complete'' build.
Ofc. this is just my opinion of how the builds should look like. So you can ofc. think a little bit outside the box if you want to.
Teemo: So for Teemo I'm starting with Blinding Dart for harrasing, that's also why I choose to buy boots from start (you also get money over to buy 3 health pots). Then I buy Meki Pendant (mana reg.) since your mana disappears kind of fast when you are harrasing. Late game I just keep buying attack speed...
LeBlanc: I'm starting with Distortion, i'ts good for harrasing and escaping. Save it untill you're lvl 2 and hav Sigil of silence. Then you can attack with Sigil of silence first and then attack with Distortion and then jump back without being attacked. Mana is not a big problem for LeBlanc late game if you play as I do, but it's a problem early game that's why I choose to have 2 Greater Quintessence of Replenishment. Items is focused on Mana reg. early game and Ability power late game.
Dr.Mundo: Mundo is both a great tank and a great damage-champ. One thing you have to think of is that early game Mundo is NOT invincible, HE CAN DIE!! So wait until lvl 6 (at least) to tank. Early game it's good to have boots of swiftness since you can run back and forth, from side to side and throw your cleaver at your opponents.