Cavern of Souls (AVR) #226 [EN/F]

Land · As this land enters, 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. · Illustrated by Cliff Childs · Avacyn Restored #226 · EDHREC rank 114 · Magic: The Gathering, MTG