I am 12/12 on this. Thought I might as well share my strategy since it hasn't failed yet.
Job setup:
Sam/Thf (preferably) but any slashing type DD with thief sub will do.
Rdm/Whm (preferably) but Whm is fine as well.
Nin/War (preferably) though others have confirmed that Pld will work as well.
Strategy:
Take food before entering. Enter and let Rdm give out all according buffs, sam meditates right away, and nin casts Utsusemi: Ni naturally. Rdm rests and recovers mp while waiting for Sam's meditate timer again. This can take awhile but it is worth it seeing as how you are more likely to win.
When Meditate is almost ready again, line up behind Shredded Sampson. Let Sam SATA ws onto you, go around and meditate again for a quick SA ws from behind. Mage should be close enough to cast cursna but far away enough to be safe from Bane. If you want to be safe I recommend bringing Holy Waters. Other than that, just have Nin keep hate. That seems to be the hardest part of the BCNM since it's very straightforward.
Make sure to line up correctly because Sam missed me completely one of the runs. He died right afterwards but Rdm and I duo'd it for the win. Anyways, good luck and enjoy those elusive earrings.
Edit: Any DD job with thief sub is ok, however, I chose Sam/Thf because of SATA ws at start and because Nin and Sam both have slashing weapons which Shredded Samson is weak to. If DD dies you still have chance to win. Also, don't try to land any spells on it besides Dia. Most likely you're gonna waste MP though Rdm once got paralyze to stick much to my surprise. Ok that's it.
Edited, Thu Feb 23 19:15:16 2006