99%? I think that's a huge exaggeration. Turn one Undertakers are easily taken care of with frostbolts, wraths, win axes, backstabs, earf shocks, lightning bolts, rock biters, and dark bombs. None of those are premium removals. The only class that can't insta gib it on turn two or one+coin are pallies and they still have truesilver, shielded minibots, and scarlet purifiers to turn to if it gets too bad.
I just had a game against a rogue who had double mech warpers, an annoyatron, and a harvest golem all on the board on turn three. Thats a taunt, a divine shield, and 7/11 on the board going into turn 4. How do you counter that? Maybe a druid that can coin/innervate into an Ancient of War on turn four?