Urza, Lord High Artificer + Forensic Gadgeteer + Sensei's Divining Top + Herald of Kozilek

Urza, Lord High Artificer

Forensic Gadgeteer

Sensei's Divining Top

Herald of Kozilek

How it works

1. Cast Sensei's Divining Top by paying 0.
2. Forensic Gadgeteer triggers, creating a Clue token.
3. Activate Urza's first ability by tapping the Clue, adding .
4. 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.
5. Activate the Clue by paying 1 and sacrificing it, causing you to draw Sensei's Divining Top from the top of your library.
6. Repeat.

This fascinating loop relies on a brilliant reduction of costs: thanks to Herald of Kozilek, your colorless spells—specifically Sensei's Divining Top—are completely free to cast, while Forensic Gadgeteer cleverly slashes the activation costs of your artifacts down to size. Once Sensei's Divining Top is on the battlefield, you tap it to draw a card and place it back on top of your library, allowing you to easily draw it again by cracking the Clue token that Forensic Gadgeteer created upon cast. To fund this recurring draw, Urza, Lord High Artificer steps in by turning that very same Clue token into a mana source, tapping it for blue mana so the entire process feeds endlessly into itself.