Kayran packs a lot into one card. It’s an 8-strength Hero, so special cards, weather and abilities can’t touch it. It’s also Agile, so it can go in Close or Ranged Combat, and it has Morale Boost, which gives +1 strength to every other unit in its row. One catch: Medic cards can only revive non-hero units, so once a hero lands in the discard pile it stays there.
Kayran has no fixed seller. It’s a random reward for beating generic gwent players such as merchants, innkeeps and villagers. It counts toward Collect ‘Em All.
