뒤집힌 빙산

When this artifact enters, mill a card, then draw a card. (To mill a card, put the top card of your library into your graveyard.)

Craft with artifact (, Exile this artifact, Exile another artifact you control or an artifact card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)

Whenever this creature attacks, you may tap or untap target artifact or creature.