Manaless Champions
I disagree with the premise completely.
All abilities cost SOMETHING. Mana, health, or whatever. No one should get a free ride. Its ridiculous and obnoxious to see a champion spam abilities withouth ever having to consider, tactically, what might happen if they run out of mana and they are too deep and get caught.
No champion should be free from that worry, unless the trade off iis like...10 percent of your health to dive to safety.
Basically, all Riven mains can go die in a fucking ditch.