Skyclave Apparition is a rare Creature — Kor Spirit card from Bloomburrow Commander (BLC), collector number 154. Current market price: $0.31, TCGplayer market prices via Scryfall.
When this creature enters, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less. When this creature leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.