this is my first time at this, sorry if its missing some things, pretty straight forward build, AP/AS items.

For runes, chose tanky if your and aggressive player, it will help you stay in lane longer, and survive early team fights better. If your a more conservation player when it come to health, then take AP marks and seals, AS glyphs and magic penetration quintessences, this will cause a considerable amount of extra damage early game.

Take all the AP and AS runes as well as the magic penetration runes to make abilities more affective towards tanky enemies.

When it comes to items, build and AP/AS hybrid build with some items for defense for team fight survivability. Sun out different items depending on the team your playing against, such as death cap for Zhonya's hourglass if they're a more damage based team and you are being focused.

Max toxic shot first and move quick last. Taking Noxious trap at lvl 6, 11, 16.

This build wont give pure attack speed like some others, but this build will give you the survivability that all squishes need and more damage on poison and mushrooms. All in all it's a great build for the more aggresive player and will pick up a lot of free kills on mushrooms.

thank you for reading and i hope you use this build and do well :)