Note: 
's W applies the 'Ground' effect
's W : Because every champion with blink /dash makes his ult useless
's W : Because Karthus is pretty... immobile mage.
's E : Makes Q - W - Q combo much easier
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Singed and Kog's slime puddles would both be good candidates for Grounded since they're both totally immobile champions.
If you are going to nerf so many champ who have some mobility their win rate will drop like a rock and their damage or own personal CC will be buffed.
Are you sure you are thinking this "anti mobility creep" idea through?
None of these champions deserve this status. If a champion deserves this than it would be in the 
rework. Because thematicly "Mega Adhesive" would fit nicely with his playstyle. As far other champion goes. I don't think their are any other candidates left.
E: Hail of Arrows
Honestly that's the only one I can think of. It makes sense thematically and Varus needs some love for the mobility creep.
