Falco Spara, Pactweaver + Sensei's Divining Top + Uthros Research Craft + Stone Calendar

Falco Spara, Pactweaver

Sensei's Divining Top

Uthros Research Craft

Stone Calendar

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 clever engine turns Sensei's Divining Top into a self-sustaining draw loop by utilizing Falco Spara, Pactweaver to cast it directly from the top of your library for free. Stone Calendar provides the crucial cost reduction that drops the Top's mana value to zero, while Falco Spara's ability lets you pay that zero-mana cost by simply stripping a counter off another permanent instead of using mana. Meanwhile, Uthros Research Craft acts as the perfect battery and payoff, replacing the shield counter Falco Spara would otherwise exhaust by feeding charge counters back onto itself every time an artifact spell is cast.