You've never actually explained why you think this card is good, despite the overwhelming amount of thought out arguments provided by myself and a couple other of posters. I'm very curious to see the reasoning of someone who genuinely thinks this card is good.
Note that I play shaman.
*Any card that that can remove and leave a body on board is great. It's why fire elemental is a staple 6-drop for any mid-range shaman.
*Shaman doesn't really have any great 4 drops. Most are 1-3-cost with overload, or higher than 4. It's a good cost tier, just like dr boom was a welcome addition for 7.
*Shaman needs more target removal but there are already too many spell cards competing for a spot in any shaman deck.
*Shaman can easily fill up a board and at the same turn play a 4-drop. It doesn't even have to be a "win more" situation, altho yeah that's probably gonna be the case many times. Ghost wolves, Naxx spiders, Tuskarr totemic, totems in general. Getting 4 bodies on the board, even weak 1/1s is not a huge problem.
*The 4 dmg can target anything not just minion (so it's like elemental and corruptor). So it can ping face for more than a lightning bolt. Probably not gonna be a common occurrence, but the potential is there.
*4 dmg kills many more minions than the 3-pings of fire elemental and corrupter.
In short, it fills a good slot and role in a bloodlust/mid-range shaman deck.
Must be played to find out if it's good of course, hence why I want to craft it. But there's too much potential to write it off as irrelevant.
As for other classes than shaman... I don't know. Potentially zoolock and ebola, but I don't think either of those are in as much of a demand of a 4-drop as shaman. Shaman plays slightly heavier creatures at the cost of overload, but can still fill the 4 bodies required without too much of a hassle.