Cavern of Souls [Modern Masters 2017] Shadows over Innistrad Prerelease Promos If an effect causes you

If an effect causes you to discard a card

Annihilator 4 (Whenever this creature attacks

This noise is so loud it echoes through the trees and seems to come from all directions at once

if it had no -1/-1 counters on it

put one of those cards on top of your library and the rest on the bottom of your library in any order

Cavern of Souls [Modern Masters 2017] Shadows over Innistrad Prerelease Promos If an effect causes youSet: 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.