Spell Queller is a rare Creature — Spirit card from Pioneer Challenger Decks 2021 (Q06), collector number 10. Current market price: $0.38, TCGplayer market prices via Scryfall.
Flash Flying When this creature enters, exile target spell with mana value 4 or less. When this creature leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.