Vraska, the Silencer is a mythic Legendary Creature — Gorgon Assassin card from Outlaws of Thunder Junction Promos (POTJ), collector number 237s. Current market price: — (foil $4.37), TCGplayer market prices via Scryfall.
Deathtouch Whenever a nontoken creature an opponent controls dies, you may pay {1}. If you do, return that card to the battlefield tapped under your control. It's a Treasure artifact with "{T}, Sacrifice this artifact: Add one mana of any color," and it loses all other card types.