Cavern of Souls (0410f) (Borderless) [The Lost Caverns of Ixalan] Pioneer Many scholars believe that these

Many scholars believe that these creatures were the result of Urza's first attempt at mechanical life

and the slavering maws of unknown evils

If that spell is countered this way

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {1}{B} Target player sacrifices a creature

Set: International Collectors' Edition Type: Instant Rarity: Rare Cost: {U} Target spell or permanent becomes blue

Cavern of Souls (0410f) (Borderless) [The Lost Caverns of Ixalan] Pioneer Many scholars believe that theseSet: 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.