Palamedes, Master Warden

Partner with Camilla, Hand of the Library (When this creature enters the battlefield, target player may put Camilla into their hand from their library, then shuffle.)

At the beginning of your upkeep, scry 1.

Whenever a nontoken creature you control attacks, investigate. (Put a colorless Clue artifact token on the battlefield with: "{2}, Sacrifice this artifact: Draw a card.")—
"I’ve got a perfectly baseless assumption, and every scholar knows that this is where you begin."