... my god those are some TERRIBLE base stats... 666 at LMB?
And you might not even be able to LMB her, which would leave her to around ~614ish Atk?
If memory serves, Sanahtlig calculated Yamata-no-Orochi at 0-stars is about +-0 net gain in specific circumstances. Seeing as 0-star Yamata-no-Orochi is slightly higher in base atk at 0-stars already, I don't see Vine being any better.
The question is... Sanahtlig? If somebody was crazy enough to farm a 3-star Vine for 30% Dark Elem attack, would it that be a good FriendList pick for Dark teams who have -40% Def? As in, trading 45% -> 30% Elem atk for -40% -> -50% Def?Rare mobs usually do, yes. But their appearance rate isn't anything impressive.