Retreat to Emeria + Haru, Hidden Talent + Crosis's Catacombs

Retreat to Emeria

Haru, Hidden Talent

Crosis's Catacombs

How it works

1. Play Crosis's Catacombs.
2. When Crosis's Catacombs enters, it and Retreat to Emeria trigger.
3. Resolve the Retreat to Emeria trigger, creating a 1/1 Kor Ally creature token.
4. When the Kor Ally enters, Haru triggers, earthbending Crosis's Catacombs.
5. Resolve the Crosis's Catacombs trigger from step 2, causing you to sacrifice it
6. Haru triggers, returning Crosis's Catacombs from your graveyard to the battlefield.
7. Repeat from step 2.

This clever loop centers on the recursive nature of Crosis's Catacombs, which constantly resets itself to fuel your engine. Every time Crosis's Catacombs enters the battlefield, Retreat to Emeria triggers its landfall ability to produce a 1/1 white Kor Ally creature token. That new Ally immediately awakens Haru, Hidden Talent, whose earthbend ability turns the land into a creature before the Catacombs' own sacrifice trigger can resolve. When the temporary land-creature dies, Haru, Hidden Talent brings Crosis's Catacombs right back to the battlefield tapped, instantly restarting the entire sequence for infinite triggers and tokens.