Dad's Journal

At the beginning of your upkeep, investigate.
(Create a Clue token. It's an artifact with
"2, Sacrifice this artifact: Draw a card.")
{t}, Sacrifice three Clues: Search your library
for a card, put that card into your hand,
then shuffle.
(Base Card—Tamiyo's Journal)
"It talks about this specific scenario
in dad's journal!"
—Sam Winchester (every other episode)