Falco Spara, Pactweaver + Sensei's Divining Top + Uthros Research Craft + Etherium Sculptor

Falco Spara, Pactweaver

Sensei's Divining Top

Uthros Research Craft

Etherium Sculptor

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 Diving Top from the top of your library by paying 0 and removing a charge counter from Uthros Research Craft.
3. Uthros Research Craft triggers, putting a charge counter on it and causing you to draw a card.
4. Repeat.

This loop turns Sensei's Divining Top into a self-sustaining engine by letting you cast it repeatedly from the top of your library for free. Etherium Sculptor reduces the artifact's cost to zero, while Falco Spara, Pactweaver grants the alternative payment method needed to cast it by stripping a charge counter off Uthros Research Craft instead of paying mana. Every time you cast the Top, Uthros Research Craft triggers to draw you a card and replace the charge counter you just spent, allowing Sensei's Divining Top to cycle infinitely back onto your library.