This is one of the more important - and possibly under-appreciated - ally cards in the Outlands archetype. This is the card that prevents all your other one health "synergy swarm" Outland allies, Ethir Swordsman, Knights of the Swan, and Warrior of Lossarnach from dying off via an archery shot or encounter card which damages allies by 1.
If you use those other allies, you'll be happy to see the Anfalas Herdsman on the table to give them durability.