Armor cards Preview. Each card will have icons which dictate what classes can use it and will have both defensive and offensive capabilities just like in the online game.
from the official WOW TCG site:
“If your hero is about to take damage, you can exhaust any or all of your armor cards to prevent some or all of that damage. For example, let’s say Ta’zo blasts me for 3 damage. I can exhaust my Deathdealer Breastplate to absorb 1 of the damage. The more armor you have, the more damage you can prevent. And best of all, the damage prevention comes in addition to the armor’s game text power.”