I'm surprised they made this card for Academy. Circle of Protection is basically Fortified Position with an added bonus for Holy only, and since everything takes place in one zone, it is universally good - a must-Disperse in Academy if there is one. It's great for the Academy Beastmaster even if his creatures can't benefit from the healing.
In the Beastmaster vs Wizard core set, few creatures have much armour, and you're limited to how much armour you can put on your mage. And Academy creatures generally roll fewer dice than what we're used to in Arena, and few creatures have piercing, although you can add more (via Wolf Fury). I feel like this card is a must-include for anybody running more than a couple living creatures.