…the perfect meta was Karazhan? Are you joking? There was 1 T1 deck and it remained at number 1 untouched from the end of Karazhan until the launch of MSoG. The deck was mid-range Shaman.
https://tempostorm.com/hearthstone/meta-snapshot/standard/2016-10-10
At least DR Hunter and Druidstone got nerfed in between expansions, we had to wait until 3 months into the next expansion, when the deck had been made even stronger via the pirate package for it to finally get nerfed down to a T2 deck.