Sunken Citadel enters tapped. As it enters, choose a color. {T}: Add one mana of the chosen color. {T}: Add two mana of the chosen color. Spend this mana only to activate abilities of land sources.
2023-11-10
"Land sources" include any objects with the card type land. This means you could spend the mana to activate an ability of a land you control or a land card in your hand or graveyard, for example.
2023-11-10
You may spend the two mana added by the last ability on the same ability or on two different abilities.