Piercing Light is a common Instant card from Innistrad: Crimson Vow (VOW), collector number 30. Current market price: $0.10 (foil $0.09), TCGplayer market prices via Scryfall.
Piercing Light deals 2 damage to target attacking or blocking creature. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)