Torrentz was a torrent aggregator that got shutdown. It only linked to other torrent sites. It never had any magnet links or torrent files.
I'm also not quite sure how it got taken down. I'm currently not convinced that this site nor Wikipedia are illegal for linking to these domains. If someone can either convince Wikipedia to remove those links, or make a strong case for why this is different than Wikipedia linking, I guess I'll have to take it down, yes.