Volcanus
Wiki can help you out: https://wiki.guildwars2.com/index.php?title=Special:RunQuery/Base_ingredients_query&Base_ingredients%5B1%5D=Volcanus&Base_ingredients%5B2%5D=1&wpRunQuery=true
Edge Of Sanity [MAD] – Gandara
About 394 gold, if you buy each component at their current TP price (hint: won’t happen at those quantities).
You’ll save some G if you upgrade cores to lodestones. I think conventional wisdon is that you would get a better return on your skill points and laurels if you went other routes and then bought the lodestones, but that’s more involved than I have gotten.