Block +2s kill all low-level or even half of the medium-level decks, ESPECIALLY when paired with a set of Block Tactics. To my knowledge, there is no “Shield-Breaker” ability that removes block. Add it please?
block decks tend to rely on direct damage, and they all have 4+ energy cost. That means, if you use a low EC deck and manage to kill even 1 unit, that block deck is gonna kill itself. Even a basic Mesmer deck can take down a block deck of full uncommons.