[Legacy] Best sideboard tech against delver?

I did a quick search on reddit/online looking for a solid list of hate cards against the 4c, grixis, and bug delver but couldn't really find anything. UR delver seems to have a different enough game plan that I separate it from the rest, feeling a bit more like a burn deck than the others.

Some cards that come to mind are pithing needle and rest in peace. Back to basics and blood moon type stuff hits hard, but not many decks can run those. I don't expect any "I play this I win" stuff, but things that, when they hit play, make delver decks go "ouch, this will be an uphill battle". Thanks for all suggestions and your help!