you should post this on their forums and then ask people to give spell suggestions, like his passive being a slime skin, champions who attack Glub will have their attack slowed by ( )%.

maybe he can through down a sticky goo that slows as one spell

then as a third spell :

it can shock a single target , or if u shock a target that is over the goo, the shock travels to nearby enemy champs

ulti some bullshit over kill thing he does,

" he shoots his tongue out and eats ur soul " something along thoughs lines