Falco Spara, Pactweaver + Sensei's Divining Top + Stone Calendar + Arcbound Crusher

Falco Spara, Pactweaver

Sensei's Divining Top

Stone Calendar

Arcbound Crusher

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, Arcbound Crusher triggers, putting a +1/+1 counter on Arcbound Crusher.
4. Repeat.

This clever loop turns the unassuming utility of Sensei's Divining Top into a perpetual engine by leveraging Falco Spara, Pactweaver to cast it directly from the top of your library without spending mana. Stone Calendar ensures the Top's casting cost is completely reduced to zero, allowing you to pay for it entirely through Falco Spara's alternate cost of removing a counter from a creature you control. Meanwhile, Arcbound Crusher happily anchors the sequence, accumulating a fresh +1/+1 counter every single time the Top enters the battlefield to replace the counters you stripped away, effectively sustaining your fuel supply while churning through your entire deck.