So how's this for a Syndra nerf
Dark Sphere duration lowered to 1.5 - 2 seconds, unless they damage an enemy.
Now, Syndra can't stack her ultimate by spamming spheres and 100-0'ing your ADC with one button press, but it still gives her room to get Scatter the Weak stuns from FoW or use her W without having a minion wave nearby. If she stays in a fight, she can stack her ultimate up to its former values, but there'd be no more "press R" Syndra plays and a lot more counterplay.
Thoughts?