Matzalantli, the Great Door // The Core

: Draw a card, then discard a card.
, : 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.)

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