Updated to include the banning of Foothold of the Mad.
After extensive testing and the most recent Gencon performance, it was found that the stronghold is easily a turn and a half too fast for the environment. We tried every option in order to not ban the stronghold, but when all was said and done, the only option was the banning.
First and foremost, I want the Modern environment to be fun. It was said to me be many people that they really enjoyed the Modern tournament at Gencon... until they played against the Foothold deck. Even if the deck wasn't as deforming to the environment as it is, it is still not a fun deck to play against. There is no way to stop the acceleration that the deck provides and it is extremely consistent at doing so.
It is with great regret that the banning is needed, but in order for the Modern environment to thrive, we believe it is needed.
I am evil