Hikari, Twilight Guardian is a rare Legendary Creature — Spirit card from Champions of Kamigawa (CHK), collector number 12. Current market price: $0.16 (foil $1.00), TCGplayer market prices via Scryfall.
Flying Whenever you cast a Spirit or Arcane spell, you may exile Hikari. If you do, return it to the battlefield under its owner's control at the beginning of the next end step.