I'm sure people will disagree with me as we're all gonna have our pet hate cards; but which addition that came with GvG do you feel is the most "broken"
Define broken however you will, for myself I mean it "ruins" the fun for you by being so strong and requiring immediate counter. Not so worried by later game cards as you have had opportunity to get answers by then but my contribution would have to be Iron Sensei. Faced the "coin Mechwarper > Iron Sensei" combo enough times now and it just makes me want to concede if I see I'm against rogue before I even get my first hand. (You start turn 3 facing a 4/5 and a 2/2 which can continue to buff)
Ain't nobody got time for that!
So what are yours?
(Please try to limit it to the new cards)