Alela, Artful Provocateur + Cathars' Crusade + Ancestral Statue + Crystalline Crawler + Yarok, the Desecrated

Alela, Artful Provocateur

Cathars' Crusade

Ancestral Statue

Crystalline Crawler

Yarok, the Desecrated

How it works

1. Cast Ancestral Statue by paying 4.
2. Alela triggers, creating a 1/1 Faerie creature token.
3. When the Faerie enters the battlefield, Cathars' Crusade triggers twice, putting two +1/+1 counters on each creature you control.
4. When Ancestral Statue enters the battlefield, it and Cathars' Crusade trigger twice.
5. Resolve the Ancestral Statue triggers, returning it and the Faerie from the battlefield to your hand.
6. Resolve the Cathars' Crusade triggers, putting two +1/+1 counters on each creature you control.
7. Activate Crystalline Crawler's first ability four times by removing four +1/+1 counters from it, adding 4.
8. Repeat.

This intricate loop revolves around repeatedly casting and bouncing Ancestral Statue, whose entry triggers are doubled by Yarok, the Desecrated to feed your entire engine. Every cycle is supported by Alela, Artful Provocateur converting each cast into a fresh Faerie token, which in turn supercharges Cathars' Crusade to permanently swell your board with massive +1/+1 counters. Meanwhile, Crystalline Crawler acts as your mana battery, utilizing its own accumulated counters to pay for the Statue's casting cost over and over again.