It can lull people to sleep and make them dream. It is active during nights of the new moon.
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Artist
Once during your turn, when you put Darkrai from your hand onto your Bench, you may choose 1 of the Defending Pokémon. That Pokémon is now Asleep.
Darkness • Darkness • Colorless
If the Defending Pokémon is Asleep, remove 4 damage counters from Darkrai.
Darkness
At the end of your opponent's next turn, the Defending Pokémon is now Asleep.