I just played Cassiopeia vs Ekko...
Laning phase: He NEVER runs oom, I actually won many trades, but Cassiopeia gets oom after 2 or 3 trades, so I decided to just farm up and play passive, he would just pot up and wave clear easily with his Q, that damn ability does too much damage, its hitbox is insane, it also gives a huge slow and costs too little mana for what it brings. As the game went on, he would just E, AA me, and proceed to run away with his MS passive... if I decided to chase him, he would just ult and proceed to explode me. He tower dived me once, I ulted him in his face, he would just have thrown his Q and an ignite and when I ulted, he just ulted while in CC! NO Assassin is that safe, Zed can't go back to his shadow while he is ccd... I don't know why Ekko's R does not cost any mana, that's stupid for such a strong ability. In the video, when he time traveled the few seconds back, he turned his arm device, how can he do that when he is turned into stone? LOGIC. He would then proceed to burst everyone over and over again, just by that cheap E+AA+Q combo, then run away.
I really hope those pbe nerfs to him are just a little taste for more upcoming nerfs. He needs his Q's width, ratio and slow reduced, and also its mana cost increased. He shouldn't have that W passive, how does that thematically fits him? to deal more damage to low health enemies? that's a Zed thing, not a time shifter thing. He also needs a mana cost on his ult and that he can not cast his ult while in cc. Maybe, just increase all his mana costs, really, he never went oom the entire game.
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then Cass will go oom, and has to go back also, meaning zero gain in that trade.