Duelist of the Mind is a rare Creature — Human Advisor card from Outlaws of Thunder Junction (OTJ), collector number 318. Current market price: $0.56 (foil $0.72), TCGplayer market prices via Scryfall.
Flying, vigilance Duelist of the Mind's power is equal to the number of cards you've drawn this turn. Whenever you commit a crime, you may draw a card. If you do, discard a card. This ability triggers only once each turn.