Rootpath Purifier + Earthcraft + Wurmcalling + Matzalantli, the Great Door // The Core

Rootpath Purifier

Earthcraft

Wurmcalling

Matzalantli, the Great Door // The Core

How it works

1. Activate The Core by tapping it, adding at least .
2. Cast Wurmcalling with buyback by paying 3, creating a creature token and returning Wurmcalling to your hand.
3. Activate Earthcraft by tapping the creature token, untapping The Core.
4. Repeat.

This ingenious loop turns Rootpath Purifier into the ultimate foundation by turning every land in your library into a basic, allowing Earthcraft to untap any of them whenever you tap a creature. To fuel the engine, Matzalantli, the Great Door // The Core transforms into The Core to generate massive amounts of mana based on your graveyard's contents, providing the exact resources needed to repeatedly cast Wurmcalling with buyback. Because Wurmcalling continuously replaces itself in your hand while generating fresh creature tokens for Earthcraft to tap, you can infinitely cycle the spell to amass an endless army of Wurms and infinite colored mana.