Yes.
Each card in the Darkest Heroes collection has 4 properties each with variable likelihood of occurrence:
- Type represents one of three tiers of characters - Mobs, Bosses and Heroes
- Class represents one of seven origins of characters - Humans, Undead, Demons, Wesens and Golems
- Location represents one of five maps characters are found on - Forest, Cemetery, Snow Mountain, Dwarf's Fortress and the Darkest Castle
- Level represents one of five skill categories of characters - Beginner, Apprentice, Adept, Master and the Grandmaster
Moreover, the Darkest Heroes collection has a deflationary upgrade mechanics. Player can merge three of a kind cards to level up the character. Thus, although the collection starts with 392 cards, only few dozens will remain in circulation when leveled up, making the Darkest Heroes one of the rarest collectibles out there.