I would keep him. Harrison is next on my crafting list.
If you like to play Priest then I would craft Sylvanas. She's annoying on her own (and is flexible in other decks) but Priests have the Sylvanas + SW: Death combo that can be clutch. I would disenchant your other legendaries like Nat and Tinkmaster before I DE'd Harrison, though.
Shammies have an even nastier combo with Reincarnate.