Sensei's Divining Top + Transplant Theorist + Enthusiastic Mechanaut

Sensei's Divining Top

Transplant Theorist

Enthusiastic Mechanaut

How it works

1. Cast Sensei's Divining Top by paying 0 due to Enthusiastic Mechanaut.
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 uses Enthusiastic Mechanaut to make your artifact spells cost {1} less, reducing Sensei's Divining Top's mana cost down to zero so you can recast it endlessly for free. Every time the Top enters the battlefield, Transplant Theorist triggers to let you loot by drawing and discarding, setting up a continuous cycle of card advantage. By activating the Top's tap ability in response to that trigger, you bounce it right back to the top of your library just in time to draw it again, letting you filter through your deck and churn through your spells.