also champs with 4 dashes and a lot of cc should have some mana/energy
just like akali that doesn't even have hard cc and also irelia
if fizz uses E he uses 90 mana early game and 110 when ability is maxed
when riven uses her E to shield turret shots after harrasing u, to shield any dmg she uses NOTHING. it costs nothing, she can do it for free as much as she wants.
her Q cooldown is too short also, so she can use it for harras and for escape.