Maybe im blind, but did they forget about druid of the flame?
Im not really sure if its somewhere there but i think you missed the debuff in Dragonblight where wierd leper gnomes turn you into leper gnomes, in some catacombs just under Naxxramas
Has anyone tried the Orb of Deception on Pandas yet? :DAlso, amazing guide!
Empty Polyformic Acid Vial could also be added :P
It saddens me that there are no items that can turn you into an Ethereal. They're by far my favorite NPCs in the game.