A Basic Pokemon Card of type Darkness with the title Darkrai and 110 HP of rarity Promo from the set BW Black Star Promos and the flavor text: To protect itself, it afflicts those around it with nightmares. However, it means no harm. It has the attack Hide in Shadows with the cost Darkness, Colorless, the energy cost 2 and the damage of 30 with the description: You may switch this Pokemon with 1 of your Benched Pokemon. It has the attack Dark Hole with the cost Darkness, Darkness, Colorless, Colorless, the energy cost 4 and the damage of 90 with the description: Flip a coin. If heads, the Defending Pokemon is now Asleep. It has weakness against Fighting 2. It has resistance against Psychic -20. 
Darkrai