Ekko needs some damage tuning but has no reliable burst
In a teamfight, all that matters for an assassin is that you burst at least one carry asap and run away alive. With ekko u need to hit ur q then u have to e then u have to go into melee range and proc ur w THEN u have to ult. now the ult needs a little bit of tuning because he has utility ot make up for that. either nerf dmg or heal. ekko seems weak if u take out the dmg part completely out of ekko's ult. he will become uselss past laning phase. Just reduce the damage to .8 or something and we will all be happy.