Kemuri-Onna is a uncommon Creature — Spirit card from Saviors of Kamigawa (SOK), collector number 76. Current market price: $0.24 (foil $0.79), TCGplayer market prices via Scryfall.
When this creature enters, target player discards a card. Whenever you cast a Spirit or Arcane spell, you may return this creature to its owner's hand.