After playing a lot of Ekko..... He really doesn't need a mana cost on his ultimate

By the time you max Q first. Its already costing you 100 mana per Q. That is a lot considering your mana pool is extremely tiny and your going the full damage full burst build with ludens, lich, deathcap. Giving a mana cost to his ultimate I mean that would mean reduce the cost of your Q. Because at most if you want to wave clear, do your combo maybe twice and you are out of mana. His ultimate doesn't need a mana cost. Only thing they should be nerfing is his damage and slows.

Down vote incoming! <3