Awesome card as it works with Grimbeorn the Old and Beorn very well, especially the latter. It let's Beorn take less damage an dealing more, it's another one of the Bernstein Bear's toys like Horn's Cry, Honour Guard, and Bofur.
It also works similarly with Grimbeorn the Old as they both want to maximize their effectiveness in battle. It's kinda like the hobbit card that raises all of one hobbit's by 2.
I have had a lot of success with this card in my beorning deck with Grimbeorn the Old.