Help me figure out how to defeat full assassin teams.
Currently gold is flooded with full assassin teams. No matter who you ban there is always a katarina, trist, zed, yasuo, fizz, akali, or talon. Chances are, your lane or not, one or more of them are going to get fed. This is extremely hard for me to figure out how to beat. If I build tanky they all get quick penetration. If I play a really tanky champion then they just run circles around me. Farming till late NEVER works for me. Which seems like the most reasonable solution.
For example I had a game today with shaco jungle and Katerina mid. Obviously they got kat a quick first blood and the game was already over. At one point katarina even laughed at me when I got a spirit visage and said "I hate to go void early...."
And it wasn't even my lane. I was fighting yasuo top. I couldn't build both mr and Armor and they proceeded to suffocate our team. No matter how much cc we had or how tanky we were, if any lane gives a kill then they proceed to face roll. I've tried cc and tank. What happens is I don't have the damage to pierce their life steal as they run around and 2 shot our carries. I stun one or two but they still go Ham and steamroll. I played a lulu game once and I could not keep an akali and zed off my adc even with every heavy cc and shield I gave my adc.
What do you guys recommend or advise that I do to beat teams like this?


and assassins with resets like kat and khazix are countered. If they don't get the first insta kill they are sitting ducks and cannot escape the CC brigade raining upon them. The most important thing is to WARD WARD WARD. Assassins usually get their kills by roaming bot. If you see them coming you can either avoid the double kill and waste their time or set up a counter-gank with your jungler. DO not let assassins freely roam without vision. If your mid is facing a kat or fizz and pings "missing" then BACK UP and WARD.