Sensei's Divining Top + Transplant Theorist + Herald of Kozilek

Sensei's Divining Top

Transplant Theorist

Herald of Kozilek

How it works

1. Cast Sensei's Divining Top by paying 0 due to Herald of Kozilek.
2. When Sensei's Divining Top enters, Transplant Theorist 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 Transplant Theorist 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 Herald of Kozilek on the board discounting colorless spells, you can cast the Top for free, immediately triggering Transplant Theorist to set up a draw. By tapping Sensei's Divining Top in response, you tuck it onto your library just in time for the Transplant Theorist trigger to draw it back to your hand, allowing you to discard another card and repeat the process indefinitely.