Warning: the lists below are rich in relevant synergies, but nothing says that they will survive long in the competitive meta of the standard. Some of them will fade very quickly against the tenor decks of the meta.
Of course, do NOT craft one of these lists with your arcane dust, and wait a few days, so that the meta has settled down a bit, before really crafting legendaries in spades. If you are a free to play player, on the day of the expansion release, open your booster packs and do with the legendaries you get! No need to throw yourself headlong into expensive lists, and still too uncertain.