Idea to Help AP Kog Maw

so I played a lot of AP Kogmaw Season 5, and with the changes to make his ult an execute, it helps AD kog's ult be more useful, but it leaves ap kog severly weak once he hits 6. his ability to farm and poke is all there, but the damage from the ult poke is non existent unless you can already get them low which kind of ruins the point of ap kog.

my idea is to give Kog Maw's ult some sort of scaling similar to Kassadin ultimate, where the more you spam it, the more damage it does. the mana cost already goes up and I don't know why it doesn't work this way. the base damage with only 50 mana cost is pretty bad, but if you are spamming it and land a few, it should do good damage. especially when these ultis reach 400 mana cost, there is no real reason why the damage can't be improved upon for ap kog. at the very least, it can be an increase ap ratio only for spamming it.

idk, just my two cents. I like AP Kog, but feel unless enemy team is low he is a bit weaker than last season. he needs some love for sure.