Not really. I've ran 20 shadow master plenty in HC before. It's really good for tanking and safety against bosses but even at 20 its damage isn't enough to kill anything at a reasonable rate. A 20 ls synergized with death sentry will shred anything that's not lightning immune which that build will have trouble with (getting the first corpse anyway) without a ridiculous gear setup. Granted it doesn't have to be as ridiculous as that one-- I've done it fine with just like goreriders and a rift scepter but it does have to have better than crap you find on the ground to down enemies effectively.
And it's best to minimize the necessity of using dragon tail as best you can unless you have life tap or crazy resist/life gear cause otherwise you might die sometimes.
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No problem!
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