An iggy build that can 1v1 most of the roster with ease. Including vs another Iggy and pre primal fangtooth.
The reasoning behind this build is:
Iggy's basic attack is nothing special but it does apply slick which stacks and slows...also more slick on a target makes Molotov and turrets more effective in DOT. Higher attack speed just makes you able to apply slick more reliably, gets your turrets to target heros more quickly, and allows you to be more of a threat in between your Molotov's and oil spill.
Thus, I've made use of every item available that builds attack speed and magical power. Sadly there isn't a great deal of options, but the existing options are fine...
Crest, you go Typhoon.
The dash you get is nothing special but after some experience with using it, it can win you a 1v1 battle or get you out of a Gideon ult. The attack speed and magic damage is the cherry on the cake and supports the rest of the build.
First item - Prophecy - sets up your basic attack to actually make use of all the magical power you will be buildig.
Second item - Magnify - just adds that extra attack speed and magnifies prophecy, literally. Yes three basic hits to trigger the passive is a bit ass - but you will find the turrets trigger the passive and so it's an instant application of 50% magical damage. Which is perfect when you think about it as every three shots your pretty much instantly dealing that 50% Magical damage.
Third item - Mutilator - for more value from your basic attacks- (Update, this item is a rogue choice, pick it if you are feeling experimental, the lifesteal is definitely noticeable which is nice, but there's probably a better item that will build magical power)
Fourth item - Oath keeper - has good stats, further makes use of your magical power and basic attacks
Fifth item - go with whatever you think, up to you
Anyway, this build, you rely on mana buff or frequent recalls.
I'm on console so if you have pc aim you will probably do even better