Cavern of Souls [Ultimate Masters] Planechase Anthology The imps' warbling cries echo

The imps' warbling cries echo through Phyrexia's towers like those of mourning doves in a cathedral

You slide them on their merry way

you notice how the joints fit

Set: San Diego Comic-Con 2013 Type: Legendary Planeswalker — Garruk Rarity: Mythic Cost: {4}{G}{G} +1: Reveal the top five cards of your library

Set: From the Vault: Legends Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {11} When you cast this spell

Cavern of Souls [Ultimate Masters] Planechase Anthology The imps' warbling cries echoSet: Ultimate Masters 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.