Doesn't sound that bad-- Especially with Malfurion, or just having a giant wall on Turn4 that your enemy has to deal with sounds pretty good. This wouldn't be played in aggro so missing out on 3 damage or trade doesn't sound all that bad
4 mana 3/6 are really good stats and the taunt is really nice. But why that drawback? 4 mana 3/6 taunt seems fair enough for a class card? At least it has taunt so even with the highly unnecessary drawback its still decent in my opinion because it still protects your face. Yeah its alright.
But seriously the drawback makes no sense whatsoever.
Edit: I take my comment back, compared to senjin this is bad!