I understand the hypothetical idea of this all.
But if you would create 300 revised cards in the proper format, spread them by this forum, you are actually creating a new line of player cards instead of just critisising/discussing them.
Sure this example is exagerated, but it is only to make the point more clear. I think critisising cards is fine, just as suggesting probable improvements, but creating these revised cards seems wrong to me.
I really like the idea of discussing/improving cards, but building revised sets is 1 bridge too far (even if just hypothical). If you really like those revised card then you can make them yourself, but don't spread them by any forum/website.

