Go from planet to planet killing enemies until you get one. Could be one day, could be one year.
In the end, it will be yours.
Best of luck.
100% legit.
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easiest way is just playing the game and getting strange coins and then buying one from xur each week. I have easily had enough coins with plenty to spare just going out and playing the game and making sure I do the weekly heroic on as high of difficulty as I can each week.