Legendary Artifact // Legendary Land

{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.)

(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.

Artist(s): Piotr Dura