I've seen some videos of it post buff and it seems to perform much better than it did. I think "string of curses" looks like a very strong perk in the Crucible. I have yet to compete the bounty but I'm pretty psyched about it.
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Well in pvp I tend to try and kill my opponents, thus I usually stick to hawkmoon, thorn, or on occasion suros. String of curses is only good if you can win the 1v1, which bad juju can't.