A Basic Pokemon Card of type Darkness with the title Darkrai and 90 HP of rarity Promo from the set DP 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 Hypnoblast with the cost Darkness, Darkness, Colorless, the energy cost 3 and the damage of 60 with the description: Flip a coin. If heads, the Defending Pokemon is now Asleep. It has the ability Darkness Aura with the description: If you have Cresselia in play, each of Darkrai's attack does 20 more damage to the Defending Pokemon (before applying Weakness and Resistance). It has weakness against Fighting 2. It has resistance against Psychic -20. 
Darkrai