Mana Flare

• WWizards of the Coast2023-09-01
  Official Ruling
  Mana Flare doesn't care about any restrictions or riders your lands put on the mana they produce, such as those of Unclaimed Territory and Cavern of Souls. It just produces one mana of the appropriate type, with no restrictions or riders.
• WWizards of the Coast2023-09-01
  Official Ruling
  The types of mana are white, blue, black, red, green, and colorless.
• WWizards of the Coast2023-09-01
  Official Ruling
  If you tap a land for more than one mana, you choose one type that was produced and add one mana of that type.

Rulings via Scryfall