House Baratheon.
Loyal.
Character.
Cost: 2.
STR: 2.
Fool.
Insight.
Forced Reaction: After you lose a challenge in which Moon Boy is participating, discard 1 card at random from your hand.
The king's own fool, the pie-faced simpleton called Moon Boy, danced about on stilts, all in motley, making mock of everyone with such deft cruelty that Sansa wondered if he was simple after all.
Nicholas Gregory
The King's Peace #47.