You guys are being much to hard on this idea.
While personally, I agree that it wouldn't work too well now, in the future when there are more counter strategies to everything, more cards, and more players playing PvP, it would work since you cannont block all the counters, and there will be more people, therefore possible opponents.
This isn't a suggestion to help you win more in PvP, this is a suggestion to increase variety in PvP for the individual players who want it. It is not fail-proof, but it is a legitimate suggestion.
Please refrain from using phrases such as
It is such a horrible idea I vomit at the thought.
They are unnecessary, unconstructive, and also give other players a negative view on you.