Darkblade Agent is a common Creature — Human Assassin card from Guilds of Ravnica (GRN), collector number 164. Current market price: $0.19 (foil $0.23), TCGplayer market prices via Scryfall.
As long as you've surveilled this turn, this creature has deathtouch and "Whenever this creature deals combat damage to a player, you draw a card."