Tamiyo's Journal
Oracle Text
At the beginning of your upkeep, investigate. (Create a colorless Clue artifact token with "
, Sacrifice this artifact: Draw a card."), Sacrifice three Clues: Search your library for a card and put that card into your hand. Then shuffle your library.
Card Rulings
4/8/2016 The token is named Clue and has the artifact subtype Clue. Clue isn’t a creature type.
4/8/2016 The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.
4/8/2016 If you sacrifice a Clue for another card’s cost or effect, such as that of Angelic Purge or Tamiyo’s Journal, you can’t also pay and sacrifice it to draw a card.
It's a little strange that she only has one journal, while Venser seems to have had several. I guess she won't be starting another, because she must be dead?
In other news, is Jace really reading the diary of a lady? Uncouth, I say!
http://magic.wizards.com/en/story/planeswalkers/tamiyo
Wen the field scholar Tamiyo became a Planeswalker, the potential knowledge of the Multiverse was greater than any power she could ever desire. A blue mage, she doesn’t use brute force to get what she wants, but rather knowledge, defense, persistence, and the mind.