Clue

Clue is an artifact subtype introduced in Shadows over Innistrad.

Description
Although it does appear in the type line of a card, the type mostly appears on tokens. Clue tokens have “, Sacrifice this artifact: Draw a card.”

Clues are historically associated with the Investigate keyword action, which creates a Clue artifact token.

The first card that featured the artifact type was Parcel Myr from Modern Horizons 2. It featured the same ability as the previous tokens.

Previously, Clue tokens had been defined by the rule for the investigate keyword action. However, Fae Offering from Modern Horizons 2 was the first card to create Clue tokens without investigating. As a consequence, the Clue token became a predefined token.

Rules
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Rulings

 * Clue is an artifact type. Even though it appears on a creature (Parcel Myr), it is never a creature type.
 * If an effect refers to a Clue, it means any Clue artifact, not just a Clue artifact token. For example, you can sacrifice Parcel Myr to activate the last ability of Lonis, Cryptozoologist.
 * You can't sacrifice a Clue token to pay multiple costs. For example, you can't sacrifice a Clue token to activate its own ability and also to activate the ability of Lonis, Cryptozoologist.
 * Some spells that instruct you to create a Clue token have targets. You can't cast these spells without choosing all required targets, and if all of those targets become illegal targets, the spell won't resolve and you won't create any Clue. If some but not all of those targets become illegal, you'll do as much as possible, including creating Clue.