How do I beat a fed Ryze?
For context, I arguably had 2 factors going against me, but I'm not gonna blame said factors since it happens and I'll still need to play accordingly if it does but:
So I'm LeBlanc and my laning phase goes absolutely fine. Ryze got camped a tad and isn't really off to a great start which for me is great since being LeBlanc my early game is supposedly my greatest strength. But here's two issues that happened: My team was up more than 3x the kills at one point and we managed to secure 4 dragons, perhaps making the rest of my team overconfident (I make sure to always stay wary of a potential throw) and another early game ally who did exceptionally well started to lose effectiveness as the game went on. My ADC unfortunately isn't a conventional sustained damage tank killer and we were essentially outscaled by the enemy team; Ryze, Shen and Draven (kinda).
Draven luckily wasn't too effective even given the time to scale and Shen, despite not dying pretty much at all was still manageable due to him not doing too much damage. Ryze on the other hand was essentially their winning trump card.
So how would I go about beating a Ryze given time to scale, especially when I'm more or less powerless to duel him at all stages due to me not actually taking many kills (I hesitate to say this but the other early game ally pretty much hogged all the kills and thus a ton of our gold percentage) and even if I take Draven (and/or other squishies) out of the fight, Ryze still hits us with around 2000 damage within less than half a second to all of us at once. None of us can kill him since he builds a ton of defense and none of us actually have adequate lockdown even with a Leona (any gap in the timing and Ryze could pop Zhonyas or Seraph's Shield etc. (funnily enough, another ally and I had two roots, neither of which would actually stop him from killing us regardless of whether he needed to move).
Is Ryze's late game only able to be countered by very specific lockdown comps given the fact that he did scale? (Note that he was last pick, I wouldn't have picked LeBlanc if he picked before me; I probably would've picked someone like Malzahar into him)
PS: I made this thread mainly out of the feeling that Ryze just doesn't feel fair to play against (which is perhaps why he gets an annual rework but I digress). I'm also quite sure he's a smurf given that he was only Lv.29 but regardless of all that, this happening is a possibility and I'd like to know how to go around this.