About a week ago, after I watched another player use a very similar build in the RAs, I tried using Assassin's Promise and Shadow Form respectively with an Insightful Staff of Enchanting. The greatest problem is energy management; you lose a great deal of time waiting for energy to strike any target after your second. Assassin's Promise only solves the problem if you drop your first victim. The second problem is your ability to disable a monk; if he or she manages to circumvent important parts of the chain, you're going to have very few options; your absolute greatest fear is if you run into a monk with Blessed Light (which is probably a 1 / 10 chance). The third problem is survival; even with Feigned Neutrality, I hardly consider you to be overly durable. To some extent, Shadow Form partially solves the problem, but it does leave a six second window that a very smart or persistent player is going to exploit it. I like the build, and of the various one-target spikes available, it's not bad, but I've yet to find a sin build that I really like.
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