Farm-Based Champion Idea

For a while now I've had this idea of a champion who's abilities are completely dependent on how much farm he has, a fighter or maybe assassin class. So far I've seen champions with rage or fury like Tryndamere, Rek'Sai and Renekton but their secondary resource bar is more like a "buff this move" instead of it acting like Energy or Mana. My idea is a champion with absolutely no cooldown (except for the ult which wouldd probably max the resource bar along with some cool effect)but the drawback is your abilities depend on your farm. Say a minion dies within a certain radius of you, that would be about 5 secondary resource (let's call it Initiative) but if you last hit, you get 15. the amount you gain and maximum Initiative rises with level so that late game you don't have to dash to a lane to kill some minions so much that you have no presence. Before anyone says "No Cooldowns? OP" I'd like to say that the fact that people can punish you for trying to farm no matter who you are balances this out, not to mention that Teammates aren't exactly farm generous late game because they're too focused on pushing. I can't even count the amount of times an enemy killed me and I could have survived if I'd just managed to get a bit of life steal health from the minions that the ADC just obliterated. I haven't been figure out a name or abilities so I decided to just share the concept for anyone with ideas to go wild with.