I'd LOVE to see spell counter. What are these exactly? For spells such as Cho'gaths Feast or Kassadin's Force Pulse, little round counters that indicate how much you've eaten or what number spell you are. It'd be a great help on Cho'gath and it'd be a nice addition on Kassadin. I can't think of any other Champion that uses a mechanic like this, but I think it'd be great.

Twitch and Teemo would also benefit because of their passive poisons. Maybe a # beside the enemy's health bar?

I think it is a good idea, however the spell counter should freeze at 4 on kassadin and then reset after he uses his foce pulse, other wise it could get confusing. This would also be cool on Annie and NuNu.

Well, Kassadin needs two counters really. One for Force Pulse and the other for Rift Walk.

I recently posted asking for buff counters forTryndamere's bloodlust, this seems like a related issue.