The effect can get your some great trades and hurt vital minions behind taunts, but he is 8 mana and doesn't have an immediate effect when it enters onto the board. It should draw premium removal though.
There is other great legendaries at 8 that do more stuff, the piloted legendary from GvN for example... or Ragnaros that would deal 16 damage the same time this will do 12 (or less) to 2 foes. OFC Rag is RNG, its 8 power BGR romovable, but... just one example of imediate effect legendary.
so do the additional two minions he damages do damage to him?
You only take retaliation damage from things you attack. If it attacked the minions next to the minion it attacks that would cause an infinite loop, but it says he damages them so he does not attack and therefore does not take retaliation damage.
God if charge was 2 mana this cards value would go way up
Seems to be really strong, only thing though is that it's pretty slow at 8 mana, and is likely to get pull hard removal right after you play him. I could see a fit with slower control decks perhaps or like someone suggested ramp druid. Also, The 6 damage dodges BGH.
The art makes me think of a nightmarish mob-boss harvest golem. Yeah idk.
Hey, it's the MTG equivalent of trample. A part of me was hoping that Blizzard would turn this into a new card mechanic. Nothing necessarily this powerful, but something like "Splash Damage +X (Minions damaged by this minion also have adjacent minions take X damage.)"
Regardless, this is literally the first neutral card that deals with your opponent's adjacent minions, meaning nearly all match-ups now should have to pay attention to minion placement. Placing taunts on the sides would be a start.