Heal for a percentage of damage dealt with your abilities. Increases with each unique takedown.
Summon Aery is fantastic lane dominance and annoyance rune on Teemo. With an Auto->[Q]->Auto you're able to double-proc Aery for really oppressive early game harass damage.
Tip: Make sure you're catching Aery as quickly as possible and abusing your early game pressure.
WhyThe Ultimate Hat
The Ultimate Hat allows you to further press your role as an "annoying little s***" by keeping tons of mushrooms up at all time all around the map and keep yourself safe from ganks in lane.
Celerity synergizes well with Teemo's [W], granting a bit of extra AP while your Movement Speed steroid is active.
The extra passive Movement Speed also help keep you sage anf allow you to abuse your lane pressure with repeated autos.
Scorch is the go-to lane harass/pressure rune and is a must have on Teemo if you're looking to get the most out of your laning phase.
WhyTaste of Blood
Taste of Blood grants you a bit of lane sustain so that you're able to continuously take aggressive trades and win the lane.
Teemo has always been a champion that outputs a TON of damage to champions thanks to his mushrooms around the map. Ravenous Hunter will provide a lot of healing thanks to that damage for even better trades.