Cavern of Souls (Topper) [Ultimate Masters Box Topper] 181 You can only use the

You can only use the effect of "Archfiend Heiress" once per turn

Set: Sun & Moon: Team Up Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Set: Mercadian Masques Type: Instant Rarity: Rare Cost: {2}{G} All lands become 2/2 creatures until end of turn

it cannot be destroyed by card effects

Set: Dissension Type: Sorcery Rarity: Rare Cost: {5}{B}{B} Target player discards their hand

Cavern of Souls (Topper) [Ultimate Masters Box Topper] 181 You can only use theSet: Ultimate Masters Box Topper 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.