Can we talk about kha'zix passive ??

I made this topic in euw too : I have 100k mastery with him right now , and i think that his passive is bad somewhat with current meta He seems to be weak , and especially against a tanky team and yeah after they removed the brutalizer that hurt him so bad However after reading his lore i read that he was fragile when he came out to runeterra but he became stronger after risking his life against monsters , he becomes stronger after killing monsters "Kill. Consume. Adapt." I am really bad when it comes to think about designing champion abilities and passives But how about he gets a new passive , that is similar to nasus' q or kindred ? Like ever 1 min he have to kill specefic one to get 1 stack of a buff that increases his heal and dmg by 1% max 15 stacks Dont tell me its unbalanced as i said i am really bad when it comes to think about champion abilities I also like to read your opinions and suggestions .