It seems insane to me since it's a 7/7 body like War Golem:
http://hydra-media.cursecdn.com/hearthstone.gamepedia.com/7/71/War_Golem%28323%29.png?version=f9459e77aff604901c9c30ff54915bbe (Unsupported image host)

And it's 4 cards drawn like Sprint:
http://hydra-media.cursecdn.com/hearthstone.gamepedia.com/d/d2/Sprint%2890%29.png?version=904b6cc36e68867a8442a04a095f863f (Unsupported image host)

So it's 14 mana in stats for 7 (a net 10 with the overload). Plus, it's a targeted 4-card draw that's guaranteed to synergize with your deck so it's even better than Sprint. If I had more Murloc cards, I'd try it out.