Cavern of Souls (0410b) (Borderless) [The Lost Caverns of Ixalan] XY128 Auras you control

Auras you control

and attributes according to the rules

Set: March of the Machine Promos Type: Legendary Artifact Rarity: Rare Cost: {1}{G} If one or more +1/+1 counters would be put on an artifact or creature you control

(It can't be the target of spells or abilities

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Cavern of Souls (0410b) (Borderless) [The Lost Caverns of Ixalan] XY128 Auras you controlSet: The Lost Caverns of Ixalan Type: Land Rarity: Mythic 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.