Bad luck coupled with terrible drop rate of Skeleton Keys is such a bummer. I was very fortunate to have been able to farm both The Will of Crota and Undying Mind Strikes when they were the nightfalls prior to Rise of Iron and got more than a hundred of each Grasp of Malok and Imago Loop. Most were trash, but I found a few diamonds in the rough. Removing that option has killed the desire to run Strikes, for me. Bungie needs to improve the whole process.