The Heroes Set is the first released collection to go with Battle Cry. It consists of 195 different cards, of which 19 are creatures , 68 are weapons , 31 are shields , 46 are armors and 31 are specials.
A full list of available cards can be found at each respective equip type's page.
Cards are obtained through buying different Packs from the Booster Shop, which expands one's collection by a certain number of cards. Each pack contains a fixed number of cards, with fixed rarities.