Mysterious Elf is an unusual card: a hero with 0 strength and the Spy ability. You play him on your opponent’s side, where he adds nothing to their total, and you draw 2 cards. Being a hero, he can’t be removed by abilities or special cards.
To get him, beat Gremist at his workshop north of Gedyneith on Ard Skellig. You can only play Gremist after finishing Practicum in Advanced Alchemy, and the match is part of Gwent: Skellige Style.
Free card draw with no downside makes him a great pick for any deck.
