I don't disagree that by 2003 the mana drain was removed. As evidence by lucy spell data. Another fun fact:
Quote:
Posted: Thursday, August 30, 2001
it costs 200 mana, can cast on anybody, makes for insane mana regen with canabalize (60 shamans that arent stupid dont sit to get mana anymore) now stacks with rez effects after recent patch... it gets its own perm. spell slot just like cann/slow/malo.. if you read the last post...just ignore it hehe makes my head hurt
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So by late 2001 it probably had no drain. But it didn't stack with Rez effects until then.