Hullbreaker Horror is a rare Creature — Kraken Horror card from Innistrad: Crimson Vow Promos (PVOW), collector number 63p. Current market price: $5.95 (foil $6.82), TCGplayer market prices via Scryfall.
Flash This spell can't be countered. Whenever you cast a spell, choose up to one — • Return target spell you don't control to its owner's hand. • Return target nonland permanent to its owner's hand.