Last week, I was managed to have a copy of League of Legends once again. I tried playing my best champ on normal games to get a feel on the game. I got a screenshot of my first 5 games and the results are amazing. Not only Tahm Kench was not nerfed during the preseason but he actually got better due to changes. That +10 Adaptive Damage helps a lot specially in CS and cheeky Auto with Grasp of undying.
Tips is not to engage levels 1-3 BUT you can attack CS and have a stack of grasp then go and auto the opposing champ then back. This is effective since youwould heal from Grasp and if your opponent trades in 1 auto vs 1 auto, you also heal from Second Wind, Doran's Shield and your E Passive while he takes 1 Auto damage + Grasp + Acquired Taste Passive.
Below are the screenshots from my first 5 games after I got back.