TFT Champ Concept

There are like 60 champs in TFT, i found some that would be good for this mode.There would be a new Origin called "Regen" or sth similar to that, there will be Vladimir, Dr mundo, Nasus, their passive would be healing for __ % of dmg dealt, based on number of them like 2/4. Vladimir should be a 4 or 5 gold worth champ, Regen,Sorcerer,Demon, he would use E + W combo as his ability. Mundo should cost 2-3,Regen,Brawler, he would use w as his ability, and it would scale with his hp, and based on level it would be 3/4/5s long. Nasus should cost maybe even 1,so there would be something like stacks, or cost 2 and just using ult as his ability, he would be Regen,Sand(Shurima class). There are several champs that are literally perfect for Teamfight but they dont exist right now, some of them are: Malphite, Nunu & Willump,Rumble,Jarvan IV,Xayah,Rakan,Zac,etc.. If i mentioned sth that isn't correct tell me below.