I noticed that most of people that play kog maw dont play ap they just build a normal AD build.I play kog maw AP/AD cause with the items that I use together do alot of dmg and can burst down single or two enemies down very easaly.

This set of runes gives u the best early game stats for kog maw, it combines AD,AP and AS and alittle Spell Vamp just for when you are going 1 on 1 .These runes will give u advantage over squishy targets.

I picked Exhaust and Ignite just for early game kills.Tell your lane partner to target one enemy in lane and u both focus on him.Dont let him farm and just harras him and when the time comes Exhaust and wait for him to drop to low health then use if he runes use ignite to get the kill or if he has no escape just use ignite to ensure that u get the kill.

This build is focusing on your ultimate wich is very usefull when going AD/AP with Kog Maw.Your ultimate will have more power than usually if ur just going AD cause it will get power from your AP ąnd AD.You wont need to worry about atack speed cause of your Q=Caustic Spitlle, wich will give u passive AS.The combination of these items will also give u enough HP to be able to get two enemies out of the way easaly (i dont reccomend going up against more than two enemies at the same time cause u wont be able to outdo their DMG output).

When farming first deal with your enemies and try to harras them with a combo E=>W=>Q and when u see a minion at low HP just Basic Atack him and get the gold,but mostly just focus on the enemy champions.

In games u sometimes find yourself in a situation when your teamate is on very low HP and he needs help.Then you just do your normal combo E=>W=>Q=>R and u will ensure that your enemy is slowed and that your ally is saved,but before you jump into the save you gotta make sure that your enemie dosnt have eny escape option and that the kill is ensured,and u dont need to worry about if he is so strong for u and that u wont be able to kill him this build will burst down your target with no problem.

Pros= This build will make sure that you can outdo eny damage that your opponent can do if he is not feeded like crazy.If u time all of your skills good, u will be able to kill enyone with no problem.Timing with kog maw is most important.If u go and save your ally when he is on low HP and his death is impossible to avoid without an ally help u have to time your slow ability (E) perfectly if u wont your enemie to be slowed for the amount of time that your ally needs to escape,then just finish the enemy off.

Im sorry if i messed up a few words cause i dont relly know english that well to be able to write the whole build without a wrong word.Hope you understand XD XD.