Kami of the Waning Moon is a common Creature — Spirit card from Champions of Kamigawa (CHK), collector number 120. Current market price: $0.12 (foil $0.75), TCGplayer market prices via Scryfall.
Flying Whenever you cast a Spirit or Arcane spell, target creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)