Keyori's Teemo Build

Items:

Boots - Avoid Ganks
3x Pots - Stay in Lane

Runan's Hurricane - Double (Sorta Triple) Auto Attacks
Liandry's Torment - AP & Burn

BloodThirster - Life Steal, Ad for auto attacks

Spirit of the Lizard Elder - Good AP, regens and red buff

Then Either:
Malady - Strips Magic Defense
Zephyr - Gives defense against CC

Runes:

Magic Penetration - Reds
Mana Regen / 5 - Yellows
Magic Resist - Blue
Abilitiy Power - Quint