Try winning by populating a board with fat minions at turn 10, and you will soon learn something about this game.
While you are right with half of the cards on this list, you cannot just add unplayable cards just because they counter or answer marrowgar. It's not a good idea to add some very weak cards to answer a deco you almost never face.
Outside of Deathwing the Destroyer, these are all playable. I would have to agree with the combos like the Hunter answers... but the other ones are all viable. Anyone not running Smothering Starfish as an ETC target isn't playing to dominate the meta.