This potion can be found at Dalaran's Underbelly. Hard to be found. İts like a rare potion where can be found at Sewers of Dalaran. This potion have several funny effects.
1.Transforms you into a wasp, You can fly, cast spells, and attack in this form. But only works in dalaran/near dalaran.
2.Transforms you into a hungry Tuskarr.
3.Turns everyone(NPC/Player/etc) into a human mage wearing full Netherwind set. I think there is a bug on the beta where the users of this potion sees other players with Netherwind, but their helms and shoulders are the shown as original pieces they are wearing.