Falco Spara, Pactweaver + Sensei's Divining Top + Urza, Lord Protector + Machinesmith Automaton

Falco Spara, Pactweaver

Sensei's Divining Top

Urza, Lord Protector

Machinesmith Automaton

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, Machinesmith Automaton triggers, putting a +1/+1 counter on Machinesmith Automaton.
4. Repeat.

This loop turns your library into an endless well of cards by turning Sensei's Divining Top into a free spell, fueled entirely by the resource management of Falco Spara, Pactweaver. Because Urza, Lord Protector reduces the artifact's mana cost down to zero, you can cast Sensei's Divining Top right off the top of your library without spending any mana at all. Every time the Top re-enters the battlefield, Machinesmith Automaton swoops in with a fresh +1/+1 counter, giving Falco Spara a brand-new shield or power token to immediately pay for the next casting cost.