Impending Flux is a rare Sorcery card from Doctor Who (WHO), collector number 977. Current market price: — (foil $2.35), TCGplayer market prices via Scryfall.
Paradox — Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn. Foretell {1}{R}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)