Sensei's Divining Top + The Immortal Sun + Rook Turret

Sensei's Divining Top

The Immortal Sun

Rook Turret

How it works

1. Cast Sensei's Divining Top by paying 0 due to The Immortal Sun.
2. When Sensei's Divining Top enters, Rook Turret triggers.
3. Holding priority, activate Sensei's Divining Top by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library.
4. Resolve the Rook Turret trigger, causing you to draw Sensei's Divining Top from your library, and then discard a card other than Sensei's Divining Top.
5. Repeat

This clever loop turns the unassuming Sensei's Divining Top into a self-replacing engine by leveraging cost reduction and triggered abilities. With The Immortal Sun discounting artifacts by {1}, Sensei's Divining Top becomes completely free to cast, immediately triggering Rook Turret upon entry. By responding to that trigger with Sensei's Divining Top's own tapping ability to draw a card and place itself on top of your library, the Rook Turret trigger then resolves to draw the artifact right back out while letting you discard a card of your choice.