Pretty nice card IMO. The turn you play it, you can trade with the divine shield and then kill something off with this. Essentially giving you a 2 for 1 right then + whatever other minions you kill over the next two turns.
I have a feeling some kind of aggro or midrange Paladin will be viable after this set is released. On 5 you could also drop this with Echoing Ooze for some extra value especially if you have an Avenge in play.
This is pretty good in arena. Say turn 2 you play a 3/2, next turn they play their own 3/2, you play this weapon,kill their minion and now the opponent cannot simply play a 3/3 or 4/3, because the buffed 3/2 would be able to trade for free. And you also have a weapon.
Reverse damage and durability of Fiery War Axe, cost an extra mana but gives you a random friendly minion taunt AND divine shield.
I say its actually interesting because not only can you buff one of your minions on the field but then you can take out a minion on your opponents field as well, of course if its 2 health or less. That way your opponent cant use the minion on the field to take out the divine shield.
Edit: Completely forgot about Stormforged Axe. When compared to that, (same stats, no overload and buff a minion) Its amazing!