If quoting the FAQ is valid response to the question, you probably want to be reporting rather than replying.
Originally Posted by Chatte
Saw a fellow rogue with black magic enchant on OH (250 haste proc). Since it is not available to the spreadsheet choice I assume it has been modeled and judged not worthwhile? It has been proven to proc from poisons and poisons are applied at very high frequency for both combat and mutilate so how good is that enchant given how haste seems to take over AP at higher gear levels. (Apologies if this has already been posted)
Searching rogue forum and its various threads brings me no results other than lower uptime on black magic, I guess its a good enough reason!
check the FAQ
''Q: So I heard that Black Magic works off poisons, and haste is a good stat for us, so I was wondering...
A: ...if it was any good? Short answer: no. Long answer: nooooooooooooooooooooooooo.''