In the fantasy world of Battle Spirits, players utilize their inner "core" to summon spirits from different lands to do their bidding: Ruby red cores from the Land of War ruled by dragons; Amethyst purple cores from the Land of Undead ruled by zombies and evil snakes; Emerald green cores from the Land of Trees inhabited by seekers of the World Tree; and White diamond cores from the Land of Ice ruled by masters of machines. Answer the "Call of the Core" with this 153-card core set introduced in 40-card Starter Decks featured in two configurations (Emerald/Ruby, Diamond Amethyst) and offered in 8-count displays, and supplemental 8-card Boosters packed in 32-count displays.