How is this possibly weak? 3 mana for 4 damage is the pretty accepted level and whilst this is slightly different since it doesn't go through taunt and leads to damage, you have the possibility to instead effectively heal for 8.
Actually a great arena card for druid, sadly its not so good in constucted format.
WTF? This is a removal when you in battle for the board and a perfect answer for face damage like hunter or shamans, versatility is very important in a game without sideboard, a least one will run in every druid deck, I bet.
Is 3 mana when removal is important, and this make a huge diference, and a better and cheaper heal when life is critical.
Bite is like a duck and this card is like a horse, a eagle, or a fish, Bite try to do many things at same time like a duck (run, fly and swin) but not efficient than a horse, a eagle or a fish when does only one thing.