Big Score is a rare Instant card from Secret Lair Drop (SLD), collector number 7190. Current market price: $1.08 (foil $1.26), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, discard a card. Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")