Vraska, the Silencer (Outlaws of Thunder Junction)

Legendary Creature Ñ Gorgon Assassin - 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.