Lurking Informant is a common Creature — Human Rogue card from Ravnica: City of Guilds (RAV), collector number 249. Current market price: $0.22 (foil $0.47), TCGplayer market prices via Scryfall.
({U/B} can be paid with either {U} or {B}.) {2}, {T}: Look at the top card of target player's library. You may put that card into that player's graveyard.