Flotsam // Jetsam

• WOTC Official Reminder Textofficial rules
  Investigate — Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card."

• WWizards of the Coast2024-02-02
  Official Ruling
  Clue is an artifact type. Even though it appears on some cards with other permanent types, it's never a creature type, a land type, or anything but an artifact type.
• WWizards of the Coast2024-02-02
  Official Ruling
  If an effect refers to a Clue, it means any Clue artifact, not just a Clue artifact token. For example, you can sacrifice Wrench to pay for Alquist Proft, Master Sleuth's activated ability.
• WWizards of the Coast2024-02-02
  Official Ruling
  You choose whether to cast spells from opponents' graveyards as Jetsam resolves. If you do, you do so as part of the resolution of Jetsam. You can't wait to cast them later in the turn. Timing restrictions based on the cards' types are ignored.
• WWizards of the Coast2024-02-02
  Official Ruling
  Some spells and abilities that investigate may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. You won't create any Clue tokens.
• WWizards of the Coast2024-02-02
  Official Ruling
  A split card's characteristics are a combination of its two halves while it is not on the stack. For example, Cease // Desist has a mana value of 8 while it is in your library. If an effect allows you to search your library for a card with mana value 4 or less, you can't find Cease // Desist.
• WWizards of the Coast2024-02-02
  Official Ruling
  Each split card has two names. If an effect instructs you to choose a card name, you may choose one of those names, but not both.
• WWizards of the Coast2024-02-02
  Official Ruling
  Each split card is a single card. For example, if you discard a split card, you've discarded one card, not two. If an effect counts the number of instant and sorcery cards in your graveyard, Cease // Desist counts once, not twice.
• WWizards of the Coast2024-02-02
  Official Ruling
  If a spell you cast has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
• WWizards of the Coast2024-02-02
  Official Ruling
  You can't sacrifice a Clue to pay multiple costs. For example, you can't sacrifice a Clue token to activate its own ability and also to activate Alquist Proft, Master Sleuth's ability.
• WWizards of the Coast2024-02-02
  Official Ruling
  Split cards have two card faces on a single card. The characteristics of the half you didn't cast are ignored while the spell is on the stack.
• WWizards of the Coast2024-02-02
  Official Ruling
  Some abilities trigger "whenever you sacrifice a Clue". Those abilities trigger whenever you sacrifice a Clue for any reason, not just to activate a Clue's activated ability.
• WWizards of the Coast2024-02-02
  Official Ruling
  If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
• WWizards of the Coast2024-02-02
  Official Ruling
  If an effect allows you to cast a spell with certain characteristics, consider only the characteristics of the half you're casting. For example, if an effect allows you to cast an instant or sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Cease this way, but not Desist.
• WWizards of the Coast2024-02-02
  Official Ruling
  To cast a split card, choose one of its halves to cast. There's no way to cast both halves of any of the split cards featured in this set.

Rulings via Scryfall