Matzalantli, the Great Door // The Core LCI 0256 · rare

Matzalantli, the Great Door · {3} · Legendary Artifact · {T}: Draw a card, then discard a card. {4}, {T}: Transform Matzalantli. 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 · Legendary Land · (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.