Vraska, the Silencer is a mythic Legendary Creature — Gorgon Assassin card from Outlaws of Thunder Junction (OTJ), collector number 299. Current market price: $3.04 (foil $4.97), 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.