I’ve had a lot of success with this bad boy in a beorning deck. I would consider him to be the second best if not best target for a Beorning Skin-changer to transform into, the other target being core Beorn. You save 3 bucks and get a beast of an ally(no pun intended).
Even just to pay for this guy for the five resources would be worth it. You get a four attack ally which is very high for an ally and a great defender too.
He is a very tough all to take down.
There are also many options in the sphere to pay for this guy for cheaper such as Hirgon, who lets you also give him a boost to and you want, there is also Mablung which works great because you will be triggering his ability consistently in a combat heavy deck like the beorning archetype.
He could also be included in any deck lacking in attack power such as the hobbit decks or scout decks or quest/location control decks.
All in all, this is not an ally to overlook when making a deck.