Matzalantli, the Great Door // The Core [The Lost Caverns of Ixalan Prerelease Cards]

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.

(Transforms from Matzalantli.) Fathomless descent T: Add X mana of any one color, where X is the number of permanent cards in your graveyard.