Teemo is a champion played mostly as AP. Although i believe this is a great strategy, i think On-Hit is better. Teemos assassin capabilities when building On-Hit are incredible. His abilites are great for chase and running away. He is excellent at assassinating enemy ADCS that try to fight back and is great overall, no matter what way you build him.This is also my first guide, so cut me some slack if you think it is lacking in some areas.
Gives map control with shrooms
Rips through everything
Great 1 target damage and Good aoe in this build
Can be a great assassin and carries quite well
Passive can catch people out of position easily
Mushrooms only used for utility
Mushrooms can be destroyed with oracles
Very low HP
Ionic Spark:This is your main item. This item deals a lot of chain AOE damage every 4 hits. With huge attack speed this will proc constantly.
Berserkers Greaves: Tier 2 boots giving you good movement speed and some bonus attack speed, your dagger at the start builds up to this which is quite helpful.
Malady: After getting Ionic spark you need to get this item. It does extra damage on hit and gives extra stats.
Madreds Bloodrazor:This item does a massive amount of damage on teemo especially with all this attack speed in this guide. Great for shredding tanks and massacring enemy softies.
Phantom Dancers: Great item overall i would consider moving this up in the item order, but there that you need first to make this better. This item gives some godly attack speed and other bonus stats that are just great for teemo.
Wits End: Gives some on-hit damage and good MR if they have a lot of AP champions. Also has some bonus attack speed that is always great.
This teemo guide is based on items. If you don't get the proper items, you can't do much. Teemo snowballs very well in this guide, he gets one kill continues to get kills for his items. The reason this guide needs a lot of attack speed is because all of Teemos items give on-hit effects. The higher the attack speed, the more your items hit and it increases your damage dramatically. With the additon of madreds blood razor you will shred through any kind of resistance. There are a few situational items I would like to go over too.
Nashors Tooth: If their team is a bit AD heavy and do a lot of auto attack damage and you want to be able to spam blinding dart, this item is great for you.
Bloodthrister: If you are having issues with dying very quickly because they all burst you down while you shoot them, get this item instead of phantom dancers, it is great life steal for sustain and adds a bit of extra damage.
Mercury Treads: If their team is CC heavy i like to get these boots instead of Berserkers Greaves.
Frozen Mallet: A great teemo item, slows the enemy so you can come in for the kill and gives you some health to help counter the squishness everyone knows and loves.
Tiamat: When they usually seem to be very "clumped" up in team fights you could get this, it works really well with Ionic spark and attack speed, dealing even more AOE damage. Makes your auto attack farm even better.
Side note on dorans blade: I like dorans blade when i play ADC but when i play teemo all it really gives is some life steal and a bit of damage, its not really that great, since this guide is based on item procs and not damage it is of no use to us.
Also if they have a lot of stacking armor and MR build magic pent and armor pent items.
Of course, on Teemo there is the mighty mushroom. Great for farm and utility, if Teemo is built AP also a killer thing to have. Mushrooms are quite lacking to say the least in this guide, they can be used to farm at higher levels, but don't do any substancial damage. They can be used for sight or to slow as utility. I find this is a huge flaw in my build. But with the little AP there is from Malady and other items, the mushrooms are still quite a effective farm. And mushrooms can still be used as miny sight wards. So playing Teemo as a "sight ward" still works.