Hi. I think I've been grinding for this gun for a million years. When I first tried to do it I just selected the strike from Mars and did it. But to no avail. I then started searching in the heroic strike playlist. I did the heroic strikes probably 30 times and still never got the undying mind. (Did Bungie remove it from the playlist?) What's the best way to get this gun? How did you get it? Am I doing this all wrong?