When I first saw this card, I thought it was meant to be used on players, and I thought it was a weak card. Spending two cards to heal two points of damage he is not very efficient at all, it is usually much easier to take a recovery. Later I realized this card is primarily meant to heal your allies, and is one of the generic cards that is actually rather good and is tempting to include in a lot of decks. Healing an ally of two damage so they can perform their action two more times is really great. If they have a thwart value of 2, that means you are spending two cards to remove 4 threat, which is super-efficient. And you can even use it on your friends’ allies! Of course you can't do that all the time, sometimes there are no suitable allies or you need your allies to chump block for you, but that is why the game lets you pick which cards to play and which cards to use for resources.
What makes this card good is healing allies, but occasionally you may use it to heal yourself or another player in a situation where someone really needs healing and there is no better way to do it.