Sensei's Divining Top + Transplant Theorist + Foundry Inspector

Sensei's Divining Top

Transplant Theorist

Foundry Inspector

How it works

1. Cast Sensei's Divining Top by paying 0 due to Foundry Inspector.
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 your topdeck into an endless engine by leveraging cost reduction and clever stack manipulation. With Foundry Inspector making your artifact spells free, you can repeatedly cast Sensei's Divining Top for zero mana. As each new copy enters the battlefield, Transplant Theorist triggers to let you draw and discard, allowing you to tap the Top in response to tuck it back onto your library just in time to draw it again.