Cavern of Souls [The List] Alien/Trio De Dangers/Universe 9 that player adds one mana

that player adds one mana of any type that land produced

Capricious and fickle

They phase in before you untap during your untap step

Set: Universes Beyond: Transformers Type: Legendary Artifact Creature — Robot Rarity: Mythic Cost: {2}{W} More Than Meets the Eye {1}{W} (You may cast this card converted for {1}{W}

Cavern of Souls [The List] Alien/Trio De Dangers/Universe 9 that player adds one manaSet: The List Type: Land Rarity: Rare As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.