Shaggy, Ultra Sleuth

Partner with Scooby, Loyal Canine (When this creature enters the battlefield, target player may put
Scooby in their hand from their library, then shuffle.)
As long as you control Scooby, Loyal Canine, whenever Shaggy attacks or blocks, investigate. (Create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")
"Zoinks! Like, I don't think we're alone, Scoob!"