It's really cheap, so cheap that you can use it proactively to build armor instead of the current 3-mana option, which pretty much is always used at the very last second since you lose so much tempo. Will probably replace that card in every minion-based deck.
I like how a lot of classes got these small incremental heal/armor cards. But we have so many tools against aggro decks where these cards may not be worthwhile. Against control decks, the bigger, flexible heals are better like Feral Rage (and Shield Block compared to Iron Hide). I don't think we'll see these cards unless aggro really sticks around.