Further defines what type a card is.
Tags, or categories, are used to further define what type a card is - they are often subcategories of unit, special card, or artifact. They are often important for different card synergies and mechanics.
The categories currently available in Gwent are: Agent, Alchemy, Bandit, Beast, Bomb, Cleric, Construct, Crime, Crone, Cultist, Cursed, Demon, Dragon, Druid, Dryad, Dwarf, Elf, Gnome, Halfling, Human, Insectoid, Knight, Leader, Machine, Mage, Mutant, Nature, Necrophage, Ogroid, Organic, Pirate, Plant, Raid, Relict, Salamandra, Ship, Siege Engine, Soldier, Specter, Spell, Svalblod, Tactic, Trap, Treant, Vampire, Warfare, Warrior, Wild Hunt, Witcher and Witch Hunter.
Gwent’s Novigrad expansion also introduced 5 gang categories, to highlight those cards belonging to one of Novigrad’s five major gangs. These categories are: Blindeyes, Crownsplitters, Cutups, Firesworn and Tidecloaks.