Hearthpwn

Force of Nature : Dust, it's worthless now

Ancient of Lore : Dust too, anyway if you find any use to it you can re-cradt it for the same price later on.

Giant Sand Worm : Dust

Ice Block : It's probably better to have two, especially now that Mad Scientist is rotated out of standard

Brawl : I'd keep 2 copies, you never know.

Tentacles for Arms : Useless, dust

Frost Giant : I only see him being used in arena, I doubt you'll ever need it in constructed.

Majordomo Executus : Mostly useless, unless you build a deck around it. Sometimes useful in certain brawls too.