Flotsam // Jetsam [Murders at Karlov Manor]

Flotsam

Mill three cards. Investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this artifact: Draw a card.")

/

Jetsam

Each opponent mills three cards, then you may cast a spell from each opponent's graveyard without paying its mana cost. If a spell cast this way would be put into a graveyard, exile it instead.