I like the card. If it were a different mana cost, it would be easier to slot in. As it stands, in a weapon rogue, you have to choose between this, Naga Corsair and Phantom Freebooter while having Obsidian Shard also come up at 4 cost before you play any out-of-deck cards. I'm not sure which to go with and will have to make some hard decisions when putting together a deck for this.
Playable. Since this reads: Battlecry: Give your weapon +1 durability. But it's probably too slow for aggro-control decks and not too much value and a bad body for Miracle/Control rogue. We'll have to see how it fares.
This card is definitely playable, even borderline good. If it was a 5/4, I think we would see a 2 of in any deck running shadowblade. You get immediate value off of him the turn you play him, which is incredible value in hearthstone. Your weapon allows you to deal with minions who threaten to trade up. He could see play if shadowblad is so good that it deems him worthy. Any other weapon is pretty much pointless. Obsidian shard has enough charges, as does assassins blade. So it's really only shadowblade that will make or break this card.
I know its a stretch but this can combo with a couple cards pretty well. One being Violet Illusionist, another being Fool's Bane. Unlimited attacks with no durability issues is a nice way to board clear, just a shame its so many intensive.