Since day 1 of D2 I've never found one single Antiope-D. NOT. A. SINGLE. ONE. Yesterday, I opened more then 75 Banshe's Engrams. I got EVERYTHING but not a single Antiope-D. Last days I opened hundreds and hundreds of them, stil nothing! I talked to other players and they told me that they got the same problem: they simply can't find the Antiope-D, they've never found one! It's like that some players can't find it, like the -blam!-ing thing is bugged for some reason or is locked. Wtf?
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Try Shaxx because it's a Crucible weapon. It don't have it (nor do I know exactly how to get it) but every Crucible themed weapon I've got either came from Shaxx or Hawthorne's Crucible engram. Yeah, yeah, I know the Crucible sucks (which is why I tend to avoid it) but I'd say that's your best bet.