na you want something like 120ar/dual leech/res/stats/life for it to be better than bk. pretty sure a 40ed Opalvein ring is way better than bk now with ROTW 40 enhanced damage on a ring is insane.
Nope.
40 life on rare ring would be the same as 20 STR as druid gets 2 life per hard point into vit.
1 str =1% ED for most weapons or .75% for some
1 Dex = .75% Ed for some weapons or saves you 15 hard points into Dex which you can then point into STR to get 1% ED for
So a rare ring with 40 life, 20 STR, 15 Dex is 55% ED for some weapons or 41.25% ED for some weapons.
Then you still have 3 prefix’s to use such as AR, mana or resist.
Or if you want to sacrifice STR Dex or life for FCR, your rare ring can still give you 10% FCR and 40% ED and still have 3 prefixes to use such as AR, mana or resist.
All in all, opalvein with ED% across any build is worse than a good rare ring by a pretty wide margin.