Flotsam {1}{G/U}
Instant
Mill three cards. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
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Jetsam {4}{U/B}{U/B}
Sorcery
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.