Dodds said that such changes need to be made when cards cause non-interactive games, are frustrating to play against, are causing confusion, aren't intuitive enough, are too strong compared to other cards with a similar cost, or are too weak. "Hearthstone is at its most fun when you're solving an interesting puzzle each turn," he wrote. "Your opponent's minions, your minions, and the cards in your hand are all pieces to this puzzle, and when your opponent removes parts of the puzzle, it can be less fun to play."
Even with these reasons, Dodds promised that the team plans to make "very few card changes" when Hearthstone goes into open beta. "Giving you confidence in your cards and the play environment is very important to us, and each card change we make potentially undermines that confidence," he said.