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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i haven't run a lot with juju because i don't main my warlock but the string of curses IS amazing. i was able to take on 4 guardians by myself because i didn't have to reload. i ended up going 20-1 on that game.