Matzalantli, the Great Door

T: Draw a card, then discard a card. 4, T: Transform Matzalantli, the Great Door. Activate only if there are four or more permanent types among cards in your graveyard. (Artifact, battle, creature, enchantment, land, and planeswalker are permanent types.) // The Core (Transforms from Matzalantli.) Fathomless descent — T: Add X mana of any one color, where X is the number of permanent cards in your graveyard.

Centuries ago, under siege from the Mycotyrant, the Oltec sealed the Core off from the world . . . until Huatli's party arrived.