Tamiyo's Journal - 265 R SOI

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 . . .
rare
Legendary Artifact
From the Magic: The Gathering set Shadows over Innistrad.