The Fourth Doctor + Displacer Kitten + Sensei's Divining Top + Stone Calendar

The Fourth Doctor

Displacer Kitten

Sensei's Divining Top

Stone Calendar

How it works

1. Cast Sensei's Divining Top either from your hand or from the top of your library by paying 0.
2. Displacer Kitten triggers, and The Fourth Doctor triggers if you had cast Sensei's Divining Top from your library.
3. Resolve the Displacer Kitten trigger, blinking The Fourth Doctor.
4. Resolve the Fourth Doctor trigger, if applicable, creating a Food token.
5. Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top onto the top of your library.
6. Repeat.

This elegant engine relies on Sensei's Divining Top as a self-recycling historic spell that feeds its own loop, reduced to a net cost of zero mana thanks to Stone Calendar. When you cast the Top, Displacer Kitten triggers off the noncreature spell to blink The Fourth Doctor, resetting his state while allowing you to continuously leverage his ability to play historic cards from the top of your library. As you tap Sensei's Divining Top to draw a card and place itself back on top of your library, you set up the very next iteration, concurrently generating a steady stream of Food tokens and triggers whenever it is cast from the top.