Whats a good deck / what of my legendary cards should I dust?

So I haven't played in quite a while, but I have all of the adventures besides the newest one. Some legendary cards I have are Sir Finley Mrrgglton, Brann Bronzebeard, Elise Starseeker, Emperor Thaurissan, Reno Jackson, Rend Blackhand, Arch-Thief Rafaam, Majordomo Executus, and C'Thun. What one of those should I dust and what ones to keep? I use to play aggro shaman but I was told by my friend that, the deck isnt very good specifically vs meta decks, and before that I played freeze mage. Suggestions for decks too? Thanks!