Blot Out the Sky is a mythic Sorcery card from Strixhaven: School of Mages Promos (PSTX), collector number 167p. Current market price: $2.35 (foil $2.21), TCGplayer market prices via Scryfall.
Create X tapped 2/1 white and black Inkling creature tokens with flying. If X is 6 or more, destroy all noncreature, nonland permanents.