Marchesa, Dealer of Death is a rare Legendary Creature — Human Rogue card from Outlaws of Thunder Junction (OTJ), collector number 357. Current market price: $0.40 (foil $0.48), TCGplayer market prices via Scryfall.
Whenever you commit a crime, you may pay {1}. If you do, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)