Nothing vs Thief or Pirate ship is an over-hard counter. You usually benefit from the opponent playing them! 
No. No it's not. It doesn't stop the attack, so it can't be hard, and actually... you do realize that these aren't totally worthless cards, right? Like, on a board with nothing on it but these cards and money, you play BM-thief... actually buying some thieves.
It was really just meant as a joke.
