This card was obviously designed to be a tough hero. We have played several games with him and he definately can mess up your dungeon (though, there were a few games where he barely made a difference and two where he actually made a dungeon better by entering it). If you like your epic heroes to be strong, this is a good addition. Just make sure you add strong heroes for the other treasure types so everyone doesn't just avoid Theif treasure because of Shadow Boy!