2Forensic Gadgeteer triggers, creating a Clue token.
3Activate Urza's first ability by tapping the Clue, adding .
4Activate 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.
5Activate the Clue by paying and sacrificing it, causing you to draw Sensei's Divining Top from the top of your library.