I really, truly believe Koggy needs a remake

He has the lowest pick rate of any ADC aside from Quinn. I suspect once Quinn's remake goes live in the pre-season, he'll gain the distinction of being the least used Marksmen in Solo. Problem is, you can't just buff the little Void Puppy since he's already quite solid at the LCS level due to the extreme degree of organization he gets there.

So no straight buffs, that would be bad.

And when you can't straight buff a champion, what do you do?

Make lateral changes, of course! Otherwise known as remakes.

The goal of the following remake is to preserve Koggy's identity as a long range tank busting pew pew monster. The goal would be to keep his actual damage output more or less the same. However, his damage consistency would improve at medium range while his long range damage would drop. Because if Koggy is going to be balanced in Solo without making him crazy in LCS, his long range damage MUST go down.

New innate Eldritch Acid: Kog'maw's skills and basic attacks shred 10 flat MR/Ar, stacking up to (number of times based on Koggy's level).

Why? Because the Innate he has right now serves no real purpose. By removing it from his kit that allows other aspects of Koggy to get shuffled around and improved as needed. Of all his various tools, I think his resist shred is the most workable thing to stuff into his new Innate.

Q: Kog'maw's next basic attack gains bonus range and bonus magic damage.

Why? This is actually pretty important. Kog's high range combined with heavy damage is a big part of what makes him strong up in LCS land. Divorcing the two aspects of his kit allows him to get actual improvements that will help him out in Solo. In this particular instance, Koggy gets a nice long range attack reset to afford him with a less gimpy early game. Koggy's poke remains strong, though his sustained super long range damage drops.

W: Kog'Maw passively deals (percentage) of the target's missing HP as magic damage OnHit. When activated, Kog'Maw instead deals (percentage) of the target's max HP as magic damage OnHit for (duration)

Why? This preserves Koggy as a damage threat pretty much all the time. It also gives Koggy a meaningful choice when it comes to using the active. Do you pop it to get a little extra kick out of his Qs? Or do you wait on it and activate it when someone gets into standard auto-attack range? As an aside, these changes might be sufficient reason to bump Koggy's base range up to 550.

E: No change.

Why? Because it already does its job, silly.

R: Kog'maw fires an artillery skillshot to the target location.

Right now Koggy's R is a delayed burst skillshot. It has the same amount of delay regardless of range. An artillery skillshot instead travels to the target location and then explodes. Think Galio's Q. Why? This would afford Koggy increased damage consistency at lower ranges while increasing the travel time at max range, giving enemies a bit more time to react to super long-range poke. This is, simply put, another change aimed at making his LCS play a little weaker in exchange for better consistency in Solo. And it honestly makes since that a skill called 'Living Artillery' should be an artillery skillshot.

So there you go. All changes aimed at shifting power around to up Koggy's damage consistency at medium range while lowering his long range threat a bit. I suspect the end result would be a champion that's much easier to balance at all levels of play.