This build is designed to maximize Urgot's Acid hunter with some items of survivability.

I take Armour Penetration Runes to prevent people from building a massive armour build to counter you. I take Mana Regen per level seals so you don't run out of mana. The cooldown reduction per level glyphs will allow for more frequent Acid Hunters. Finally the Attack damage per level quintessences are too make sure that you are doing large amounts of damage with your Acid Hunters.

I chose Flash because it is great for lining up your ultimate and great for getting those escapees. I chose Cleanse in case you get interrupted by say an Ashe's ult when your trying to kill their carry. Cleanse will allow you to shrug this off and continue killing the enemy champion.

Pros:
Against any squishy champs, you should be able to kill them without any hitches.

Cons:
Against any of the more tough champs with great escape mechanisms, this build can suffer, especially if you get zoned and can't achieve the maximum potential of your runes.

Post any feedback and any way i could improve this build in the comments, just please don't post any derogotory comments, productive criticism only! :)