Matzalantli, the Great Door // The Core

Matzalantli, the Great Door

three generic mana Legendary Artifact

tap this permanent : Draw a card, then discard a card.

four generic mana , tap this permanent : 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 — tap this permanent : 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.

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Matzalantli, the Great Door // The Core rulings

2023-11-10
Transforming Matzalantli doesn't cause it to leave the battlefield. It also doesn't cause it to become untapped.
2023-11-10
The Core's activated ability is a mana ability. It doesn't use the stack and can't be responded to.
2023-11-10
Cards with the ability word "fathomless descent" have abilities that care how many permanent cards are in your graveyard.
2023-11-10
Some descend triggered abilities include intervening "if" clauses (i.e. "if you have [four or eight] permanent cards in your graveyard" in the middle of the ability). Each of these abilities checks your graveyard at the moment it would trigger to see if it does. If you don't have the required number of permanent cards in your graveyard at that time, the ability doesn't trigger at all. If it does trigger, it will check again as it tries to resolve. If you don't have the required number of permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen.

Matzalantli, the Great Door // The Core keyword rules

Transform Rule 701.28

To transform a permanent, turn it over so that its other face is up. Only transforming tokens and permanents represented by transforming double-faced cards can transform. (See rule , “Double-Faced Cards.”)

Although transforming a permanent uses the same physical action as turning a permanent face up or face down, they are different game actions. Abilities that trigger when a permanent is turned face down won’t trigger when that permanent transforms, and so on.

If a spell or ability instructs a player to transform a permanent that isn’t represented by a transforming token or a transforming double-faced card, nothing happens.

If a spell or ability instructs a player to transform a permanent, and the face that permanent would transform into is represented by an instant or sorcery card face, or is a transforming token that was created with an instant or sorcery face, nothing happens.

Some triggered abilities trigger when an object “transforms into” an object with a specified characteristic. Such an ability triggers if the object either transforms or converts (see rule ) and has the specified characteristic immediately after it does so.

If an activated or triggered ability of a permanent that isn’t a delayed triggered ability of that permanent tries to transform it, the permanent does so only if it hasn’t transformed or converted since the ability was put onto the stack. If a delayed triggered ability of a permanent tries to transform that permanent, the permanent does so only if it hasn’t transformed or converted since that delayed triggered ability was created. In both cases, if the permanent has already transformed or converted, an instruction to do either is ignored.

Some spells and abilities refer to a “transformed permanent.” This phrase refers to a permanent on the battlefield with its back face up that’s also a transforming double-faced card or a transforming token. A permanent with its front face up is never considered a transformed permanent, even if it had its back face up previously.