Falco Spara, Pactweaver + Sensei's Divining Top + Arcbound Crusher + Temur Battlecrier

Falco Spara, Pactweaver

Sensei's Divining Top

Arcbound Crusher

Temur Battlecrier

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 relies on Falco Spara, Pactweaver to let you cast spells straight from the top of your library by trading away creature counters instead of paying mana. Sensei's Divining Top naturally feeds this system by drawing a card and placing itself back on top of your library when tapped, allowing you to replay it continuously. Meanwhile, Arcbound Crusher grows larger with every iteration by triggering whenever the artifact enters the battlefield, providing a steady supply of new counters for Falco Spara, Pactweaver to consume. Though Temur Battlecrier's cost-reduction ability isn't strictly necessary for the core loop to function, it seamlessly helps grease the wheels of your mana economy while you churn through your deck.