There hasn’t been a set with a bunch of elves in it, but they have sort of snuck up on me by just being around on several sets. Ixalan has none and we are losing some from Kaladesh, but the losses are not major and there’s some very interesting ones on Ravnica. Some I didn’t even think of as elves.
However, I don’t think we can manage a huge horde of elves that combo out fast, because the pieces just aren’t available to us in Standard. We do have a lot of midrange-y cards.
I don’t think the double-black cards are really an option, but just bringing them up here. In many ways, Elvish Clancaller is also a very midrange-y card, as it does have the ability to call the clan, as it were. The other option would be to go for green-white, but I do enjoy Golgari so much more.