Let's not forget the 3 mana 1/6 that gains 1 health every time you play a minion. Curving into this would buff that guy to 3/9 assuming he had not yet taken damage. Or you play this after tar creeper and just blow your opponent out with a 3/7 tar creeper that's a 5/7 on their turn. It's a dark freaking arrakoa on turn 4. All in all it might just be too much anti aggro tech and not enough value to not be punished by control. We could see a token taunt midrange druid that uses high health taunts to put up a wall against aggro and uses savage roar to finish off control. In which case Malfurion the Pestilent, innervate, strongshell scavenger, mark of the lotus could be a thing. That would create 2 4/8 taunts and a 2/3. Druid of the claw, savage roar, hero power deals 27 from that board.