Falco Spara, Pactweaver + Sensei's Divining Top + Yotian Dissident + Herald of Kozilek

Falco Spara, Pactweaver

Sensei's Divining Top

Yotian Dissident

Herald of Kozilek

How it works

1. Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library.
2. Cast Sensei's Divining Top from the top of your library by paying 0 and removing a counter from a creature you control.
3. When Sensei's Divining Top enters, Yotian Dissident triggers, putting a +1/+1 counter on Yotian Dissident.
4. Repeat.

This clever loop turns Sensei's Divining Top into a self-sustaining engine by letting you repeatedly draw it and recast it for free. Falco Spara, Pactweaver grants the crucial ability to cast spells directly from the top of your library while paying costs by removing a counter from a creature you control instead of using mana. Meanwhile, Herald of Kozilek smooths out the math by making the colorless artifact free to cast. Finally, Yotian Dissident acts as the catalyst that keeps the whole machine running, placing a fresh +1/+1 counter back onto a creature every time Sensei's Divining Top re-enters the battlefield so you always have the fuel required for the next iteration.