Cavern of Souls (Topper) [Ultimate Masters Box Topper] Aquapolis An update of the monopoly

An update of the monopoly folk game invented by Elizabeth Magie 100 years ago

Set: Alpha Edition Type: Basic Land — Island Rarity: Common ({T}: Add {U}

Set: Beta Edition Type: Instant Rarity: Common Cost: {U} Return target creature to its owner's hand

they're just an example of one of the packs

Cavern of Souls (Topper) [Ultimate Masters Box Topper] Aquapolis An update of the monopolySet: 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.