Falco Spara, Pactweaver + Sensei's Divining Top + Herald of Kozilek + Clinquant Skymage

Falco Spara, Pactweaver

Sensei's Divining Top

Herald of Kozilek

Clinquant Skymage

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. Clinquant Skymage triggers, putting a +1/+1 counter on it.
3. Cast Sensei's Divining Top from the top of your library by paying 0 and removing a counter from a creature you control.
4. Repeat.

This fascinating loop hinges on Falco Spara, Pactweaver turning your library's top into a casting zone by paying counters, allowing Sensei's Divining Top to endlessly cycle from the top of your library to your hand and back again for free. The entire engine is supercharged by Herald of Kozilek, whose cost-reduction ability slashes the artifact's mana value down to zero so you never have to spend actual mana to replay it. Meanwhile, every iteration feeds Clinquant Skymage a steady stream of +1/+1 counters whenever you draw a card, providing an endless reservoir of fodder to fuel Falco Spara, Pactweaver's alternate casting cost.