monolith\'s mana mill

: Each player mills two cards.

Target player shuffles up to three target cards from their graveyard into their library. Draw a card. When this card is put into your graveyard from your library, shuffle your graveyard into your library.

This artifact doesn't untap during your untap step. : Add . : Untap this artifact.

If you tap a permanent for mana, it produces twice as much of that mana instead.