
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.
Tamiyo's Journal has 12 printings, first in Shadows over Innistrad (2016). EDHREC ranks it #2,588 among Commander cards. It appears most in Morska, Undersea Sleuth decks (4,531 on EDHREC). It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.