Forensic Gadgeteer triggers, creating a Clue token.
Activate Urza's first ability by tapping the Clue, adding .
Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield on top of your library.
Activate the Clue by paying 1 and sacrificing it, causing you to draw Sensei's Divining Top from the top of your library.