We are applying a patch in the next few minutes. You will be able to complete your current game but will have to restart your client to update the game.
Great changes in terms of balancing out Pandora.
Huntmaster + Kodama was getting a little out of hand and fewer decks with 6 Grim Guards or 4 Flame Throwers will be nice.
The downside is that bumping the stronger cards to higher and higher rarities makes the barrier to entry worse for new players. You still need 3x Huntmaster and 3x Kodama to make a top tier green deck and that just got a lot more expensive to craft.