The Fourth Doctor + Displacer Kitten + Sensei's Divining Top + The Immortal Sun

The Fourth Doctor

Displacer Kitten

Sensei's Divining Top

The Immortal Sun

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 clever loop turns the unassuming Sensei's Divining Top into an infinite engine by reducing its cost to zero with The Immortal Sun, allowing you to continually recast it from the top of your library thanks to The Fourth Doctor's ability to play historic spells from the library's peak. Every time you cast the Top, Displacer Kitten triggers to blink The Fourth Doctor, refreshing your ability to play the top card of your library while generating a steady stream of Food tokens and artifact triggers. Instead of activating the Top's draw ability, you simply recast it over and over, letting its natural replacement effect put it back on top of your library to sustain the cycle indefinitely.