Shame it has 4 health, guess it's alright for 4 mana though, not a card great, but it's nice to have a new 4 drop option for Shaman. Attacking the wrong enemy isn't so bad as it would most likely be a 1 for 1 in the worst case,
Shaman has great removal on the followup turn if needed, although it does make it even less attractive to run Fire Elementals as you would overload turn 5 using Bolt, Storm or Lava Burst (Loatheb could be another play depending on the board state).
Also I can see the Spare Part that gives minion stealth for a turn is going to be pretty sick with some of these new cards *evil cackle* (sure I know the chance of getting it is low, but it will lead to some hilarious combos).
This is good against a Sludge Belcher, especially if the sludge Belcher is protecting a high value, low attack target, such as Knife Juggler. It can survive two attacks, even if both hit the Belcher (and its spawn). And you have a good chance of killing the Knife Juggler.
Also, it can kill stealthed minions.
This isn't a great card. But it's not terrible either. It has half-decent stats for the cost.
Please note that it says the wrong ENEMY. It will not hit your own characters. In addition, acording to the blue post, it can bypass stealth AND taunt mechanics.
Now, as for the card itself- Its a 4, 5/4 windfury with Overload 1. Note that Overload is NOT the same thing as +1 mana. For instance, if all you have in your hand is this card, a 3, a 2, and this card again on turn 4, you can play this card on turn 4, this card again on turn 5, and then the 3/2 on turn 6.
Now, it DOES have it's downsides, as you could easily wind up attacking the yeti, instead of the 2 squishier cards. But thats the point of RNG- You could either get bad results or fantastic results.
Without Overload this card is on par with Ogre Ninja; with Overload (1) this is next to unplayable.
Blizz cuts too heavy on the stats on Windfury minions (except that Zap-o-matic) to the point that Windfury minions need to have stealth to be good. God even spell/Hero Power immunity may increase their power level...
Disappointed. One of the worst cards in this expansion so far.