Jewel Mine Overseer is a mythic Creature — Human Noble card from Alchemy: Wilds of Eldraine (YWOE), collector number 21.
When Jewel Mine Overseer enters, conjure seven cards named Seven Dwarves on top of your library. They perpetually gain "When this creature enters, draw a card." Then shuffle. At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.