Wow if this is legit it's insane value. Is it too much? Against zoo it's as good as a brawl... You can reset their entire board. Excellent for control warrior, because if you reach turn 7 ur hp pool isnt that much of a problem most of the time. The restriction taht you cant go face is a smart one.
Compare it to the rogue weapon, that can go face but cant attack multiple times? This weapon seems op as hell. Rogue has poison and blade flurry but that's still too op.
Edit: dont know if this is legit. It would mean that as long as the weapon is active, ur hero can attack as often as he wants? like a quadruple winfury? Effects like these have been made through windfury in the past, I find it odd, dont know if it's legit.
Basically 2 fiery war axes for 1 extra mana and in 1 card. Kinda of redundant card. Against Aggro you don't really wanna clear table with your face at turn 5+, since it's asking for troubles. Otherwise there's gorehowl. For arena it's probably insane though.