This card likely won't change the aggro matchup too much, although I have had games where I stabilized against aggro but couldn't draw any heal and they topdecked leeroy on turn 11-12. I think this card is better in control games than people give it credit for. The heal from reno was still pretty useful in the control matchup, and this will accomplish the same goal I think. I think the card is playable.
3 mana 3/4 Is solid stats on its own. It makes a decent 3 drop or can be used to stabilize if you've been getting pounded in the face all game. It's basically an amalgam that has utility late game as well.
This is probably really good in spiteful priest since you have no healing spells and it's a good burst heal and not a bad body if you have to play it early. It can win games against some aggro especially a burn mage.