宝(ほう)玉(ぎょく)鉱(こう)山(ざん)の監(かん)視(し)者(しゃ)

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.