Last night, my team faced an enemy Kassadin. Despite all of us investing in magic resist, he was nearly unstoppable. Even after I purchased Runic Bulwark, Merc Treads, and Negatron Cloak, he was continually a problem. My magic resist by the end was around 185. We were able to kill him a few times, but never enough to fully turn the game around. We eventually were overwhelmed.
Looking past how strong he is (high ratios and high escape), what are some suggestions for dealing with him other than what we ended up doing?
I don't want to seem like I'm saying he needs a nerf, but it certainly seemed like it during that game. Any suggestions/opinions are welcome. I did not post this thread to whine about how unfair he is to face; however, I would love some insight so that next time I face Kassadin I will know what to do.