There needs to be a counter, but rather than coevolution of cards (where cards are developed to directly counter other cards. e.g. Flesh Spider), create a web of cards. Cards that can interact with an enormous variety of situations. So, make a card that cancels phobias, but don't stop there. Make it a card that can react to other cards in the game. Make it hardly situational, extremely versatile, even if it means sacrificing stats for skills.