In Worldbreaker, Goblin and Worgen Heroes and Allies from Cataclysm enter the World of Warcraft TCG arena for the first time - with their own keywords! Plus, new race/class combos are now available as Allies and Heroes, Dragon Master Heroes Ysera and Alexstrasza make an appearance, Flying Mounts take flight, Heirloom gear comes into play with its own mechanic, and new Hero powers become permanent! This 270-card set is offered in 20-card boosters packed in 24-count displays.