It's a grimoire card called Guardian Abilities worth zero grimoire points that was bugged. The card was supposed to drop after you created one of each character, but never would. As far as I'm aware, there was no way to obtain this card until Bungie released an update in December. This update fixed the bug so it would drop when it was supposed to. However, Guardians like myself who already created three different high level characters wouldn't automatically receive this card. We were, and are still required to delete a character (follow the instructions listed above) if we want to obtain this card. I don't want to do that, as the card doesn't do anything for you. DeeJ just said in the last weekly update that grimoire cards would drop when they're supposed to when update 1.1.1 is released. Here's hoping that means we will finally get this card without any extra effort (along with other grimoire bug fixes).