This is just an all purpose build. Do not follow this build 100% of the time. You might need to be more tankier or need more armor then mr. Use your brain when you play.

Pros

Strong Tower dives
Good harrass
Mana sustain
Fun to play
Aoe Silence
Good ult(even without ap)

Cons

Soft at start
hard to get the hang of
easy to shut down
high brust champs destroy him

There are many ways you can rune. It's mainly what you like most. You could go hybird pen. runes AD pen. runes Health runes ect.

I wouldn't play AD malz in a ranked game but if you feel like you can do it be my guest.

I level E first so I can get more farm. The reason I level my W 2nd is because you can still do good damage without ap if you ult them in your W. If you find yourself against an ad caster or ap top I would level Q 2nd so you can silence longer.

I go 9 0 21 mastiers so I have more CD and the little bit of Life steal and spell vamp helps sustain somewhat.

In team fights I find that I am focused first but you can e and kite them along pretty well. When you find yourself in a team fight you should aim your Q so that you silence most of their team.(REASON MALZ IS SO OP) A good silence can make your team destory their team. You also want to try and ult the carry on their team so you and your team can kill their carry. Make sure you dont get caught and have good postion. Dont auto attack like a normally ADC your an AD bruiser but you need to spam your skills make sure you Q and E as much as you can and place your W down before you ult. Pretty much sums up what to do in a team fight

This is my first guide and I know it's very bad but I have so much fun playing Malz I wanted to share it with people and spread it. Try out Malz sometime he's really fun and strong. Build him AP or AD he's still op in my opinion. Good Luck and keep on winning!