Hikari, Twilight Guardian is a uncommon Legendary Creature — Spirit card from Modern Masters 2015 (MM2), collector number 18. Current market price: $0.09 (foil $0.34), 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.