Rooms and devotion

[kwanyeegor-ii]

if the only nonland permanents I control are Ajani's Pridemate, Dollmaker's Shop // Porcelain Gallery, and Heliod, Sun-Crowned and only the Dollmaker's Shop door of the room is unlocked, what is my devotion to white?

[Mookie]

709.5. Some split cards are permanent cards with a single shared type line. A shared type line on such an object represents two static abilities that function on the battlefield. These are "As long as this permanent doesn't have the 'left half unlocked' designation, it doesn't have the name, mana cost, or rules text of this object's left half" and "As long as this permanent doesn't have the 'right half unlocked' designation, it doesn't have the name, mana cost, or rules text of this object's right half." These abilities, as well as which half of that permanent a characteristic is in, are part of that object's copiable values.

Only unlocked parts of the room contribute to mana cost, so if only Dollmaker's Shop is unlocked then it has a mana value of 2 and contributes one devotion (for a total of three alongside Pridemate and Heliod). If both halves are unlocked, then it will contribute three devotion (and have a mana value of 8).