The only thing I don't know is what the actual bug is:
1. it is missing a green border but is supposed to be a team card
2. it is not supposed to be a team card but it works like one
Since all other team cards mention Team in their internal name and talk about being a team card in the description, I'm guessing that Ransack is not supposed to be a team card. I bet at one point it was a team card and they changed it but forget to remove the actual team effect.