Hey! This is my first build that I am creating. It is for an AP Teemo build that I have used a lot ever since I have started playing! I believe that it can serve as a great lane carry build, mid build, or even mushroom support/carry build. It makes great use of Mushroom/poison Damage. I hope it proves effective for you and you enjoy reading!

(KEEP IN MIND: I am not the best player ever. I don't often play ranked, but This build should still be VERYYYY effective in ranked.)

PROS:
-High Damge
-Great Poisons (damage over time)
-Fastest champion on game
-Mushrooms are insane damage and a free ward on short cooldown.
-ANTI GANKS! (Mushrooms)
CONS:
-Squishy
-Quickly targeted
-Not much defense in build

The Greater Seal of Potency provide .59 flat AP. This is a nice start to a game with a flat 20 AP.

The Greater Mark of Insight is a MUST .95 Magic Pen per = 8.5 flat magic pen. This is also great for start because your poisons at level 2 will hit for more. (this will pair great with void staff and sorcerer's boots.)

Finally, the Greater Seal of Force provide a small AP per level with .17 per level, coming to about an additional 23 AP at level 18. This will help scale AP a little bit more while leveling and will give you overall more damage when paired with low level/money acquired gear.

(NOTE: the Greater Seal of Force can be exchanged for Greater Seal of Potency for more flat AP instead of scaling, making you better early game, rather than late game.)

This Mastery focuses purely on damage. You can exchange the left column of the offensive tree (normally AD-ish options) for utility or defense (I would opt for the utility over defense though, since you are ranged and can stay back.)

Start with Boots and Potions. Then go for the base items for a Nashor's Tooth. Then after you finish the 2 base items, finish boots for Sorcerer's Shoes. Then finish off Nashor's. Moving onto a Malady for speed and an on-hit. Then move on to Void Staff for Magic Pen to go with runes and boots. Then, grab a Rabadon's Deathcap for pure AP scaling and maximum damage. Then, finish with a Rylai's Crystal Scepter for Health, AP, and a slow. These items will provide amazing damage with some nice spell pen, and decent HP from Rylai's making you a LITTLE more sustainable..

Teemo's very amazing ultimate! With this build, your mushrooms are insane damage and a nice slow. End-game your mushrooms do about 1.2k damage over 4 seconds (without calculations for thier Magic Resist and your Magic Pen.) There are areas that you need them in, in order to protect from ganks, baron kills, and dragon kills (and any other buffs: red, blue, etc...)

Here is a map showing some VERY IMPORTANT options for mushroom placement. (view from being on BLUE SIDE.) The Baron and Dragon are EXTREMELY IMPORTANT!

***The Mushrooms are meant for easy random kills on roaming squishies. However, their MOST IMPORTANT use is to help prevent and warn other players from ganks. It shows where an enemy is, and weakens them for an easy kill and an assist/kill for you! Nice, right!?***

I use Ignite and Flash. Ignite for early game when HP is low and you wanna ensure that kill, or just for extra damage with those poisons! Flash is for ganks or escapes (AS ALWAYS!!!!) ignite can be exchanged for a more comfortable option, but i recommend keeping flash. Ghost isn't important because your W is already a ghost and Teemo is the League's fastest champion.

NOTE: These 3 games were played in different settings.

Game 1 was a custom 5v5 on summoner's rift made up of all random players in a game that I created, they were all level 30 with runes and team structure.

Game 2 was a normal random game 5v5 on summoner's rift of only level 30s.

Game 3 was a 1v1 on Proving Grounds(Which doesn't show much because its easy to build against the enemy.) against a very skilled Ashe (carry vs carry) We both build pure carry with no defense (I followed my build.)

It proves to be quite effective and I am sure it will do the same in ranked.

*If you are carrying then you want to get those last hits. Farm some gold, get fed! You can (ONLY WHEN YOU HAVE YOUR MUSHROOMS IN NECESSARY SPOTS, ie: Baron/Dragon and brushes) use your mushrooms when a lane gets SUPER heavily flooded with minions. This is only useful late game when minions can potentially push your tower.

Since you are ranged you want to HARASS the enemy hard. Do NOT let them kill minions or get last hits.

*If you are support/carrying then focus on keeping mushrooms in brush for any potential flanks and ganks, and first hitting minions to weaken them for your partner.

Teemo is a very fun and fairly easy champion to play. I hope you enjoy playing him, and I hope you find my guide very effective. Thank you very much for reading, and I hope you learned from this! Please Leave a comment and Rate my guide! thank you kindly!

-Mr Smexisauce