Tamiyo's Journal {5}

Legendary Artifact

At the beginning of your upkeep, investigate. (Create a Clue token. It’s an artifact with “{2}, Sacrifice this token: Draw a card.”)

{T}, Sacrifice three Clues: Search your library for a card, put that card into your hand, then shuffle.

Entry 434: There’s more to Avacyn’s madness …

Illustrated by Chase Stone

Faces, Tokens, & Other Parts
Tamiyo's Journal, INR #272
Clue Token, TINR #22

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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. (2016-04-08)
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. (2016-04-08)

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. (2016-04-08)