So... this class has a 70%+ win rate versus this class

Are you talking about the linear game play of a Quest Shaman?

Turn 1 play the Quest and the linear 1 2 3 game play begins?

Then drop the Questing Explorer on 2
on 3 Drop another Questing Explorer
turn 4 drop Evil Cabal Rat and Novice Engineer
Turn 5 Now use your Bog Slosher with the Lackeys Quest Complete

Now for 2 rounds spam the board with hundred of lackeys and discover more minions, spells, mutate and plus rush lackeys?

*And lets now forget the Mogu Fleshshapers that get dropped for free.

One 9 play Swampqueen Hagatha and load up on 4 spells - mutate all those lackeys in legendaries etc

Is this what your talking about OP?

A lengthy game of rock paper scissors?

we need someone who knows trollspeak