Quicksilver Dagger is a common Enchantment — Aura card from Duel Decks: Izzet vs. Golgari (DDJ), collector number 26. Current market price: $0.18, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has "{T}: This creature deals 1 damage to target player or planeswalker. You draw a card."