Unexpected Windfall is a common Instant card from Fallout (PIP), collector number 193. Current market price: $2.95 (foil $8.08), 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.")