Hearthpwn

Now knowing the full DK card list, I think the only deck that wants to run this is specifically a 2-Blood 1-Frost deck, that runs 2 copies of Bone Breaker and Soulbreaker. If you're running 0 Frost runes, there aren't enough good weapons, with the only 2 others being Frostmourne and Corrupted Ashbringer. If you're running 2 or 3 Frost Runes, you want to run Overseer Frigidara, and then this not being a Frost spell makes it not worth running. Luckily for this card, there is hope for that specific deck, but the card happens to be less useful than it looks on the surface. Of course, if Frostmourne or Corrupted Ashbringer end up actually being viable, or Overseer Frigidara ends up unexpectedly bad, this could be wrong, but this is how I think it'll play out.