Omenport Vigilante is a uncommon Creature — Human Mercenary card from Outlaws of Thunder Junction (OTJ), collector number 21. Current market price: $0.15 (foil $0.16), TCGplayer market prices via Scryfall.
This creature has double strike as long as you've committed a crime this turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)