iv allways givin this alot of thought now your talking a strait up slug match end biuld no pulling out and healing no kiteing correct?
out of all the champs atm it would be nasus his defenently up there there is no question about it and if there is no limit to how long he has been farming for well then its a win for him because shit then he could have 100000000 stacks and 1hit anyone but noone will ever come up against that because no game ever gose that long so its not realistic. but if the had been going for say 30mins-an hour like a game realisticly gose for then out of the champs we have now it would be out of:
nasus,yi,tryda,yorick,illaoi,lerlia and jax. popy dosent have the dammage output to outway yi or nasas i wouldent consider him one and olaf and darius have nochance they just dont scale well enough.
if you include old champs sion before the rework took the cake %100 lifesteal and attack speed for 17seconds as an ult stacked hp of cs for infinate scaleing so with fullcrit hit with just armour and mr coming out with 3-4k hp tanky with %100 lifesteal and att speed for 17seconds??? noone had a fucken chance you could 1v1 end game yi and come out fullhp and same with most champs the only way to kill him was to gang up 4v1 and cc him to stop him from healing and you needed alot of it since he was tanky or kited him. the only champ that would have a chace then was nasus because of wither slowing his attack speed but i useto take cleanse when laning against him then even end game id cleance his wither once and he would be dead before he could use it again.