Clearly you are a master game designer who can understand and play the game better than the top players on the ladder, and we should all nerf whatever cards you don't like because they must be OP. Everything you state is fact and anyone who disagrees with you is obviously wrong. There is no need to support your wonderful opinions with evidence, because empirically you have already proven you know more than everyone else put together.
Yellow is probably the most undertuned of any color right now! Place a couple of Taunts and/or cheap damage spells in your deck and laugh in its face. Kind of like I'm laughing at the matter-of-fact tone you used in the same sentence as your claim that "yellow is beyond op".
Or if you're still so convinced Yellow is OP, make a Yellow deck, take it onto the ladder, and make it to the Top 50 players with a positive winrate. If you can manage that, you'll at least have a leg to stand on when you make such an argument.