Cavern of Souls [Modern Masters 2017] Shadows over Innistrad Prerelease Promos defending player exiles the top

defending player exiles the top twenty cards of their library

Spend this mana only to cast artifact spells

then sacrifices the rest

Yellow Scarves General can't block

Maro-Sorcerer's power and toughness are each equal to the total number of cards in all players' hands

Cavern of Souls [Modern Masters 2017] Shadows over Innistrad Prerelease Promos defending player exiles the topSet: Modern Masters 2017 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.