Matzalantli, the Great Door // The Core

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