Cavern of Souls [Avacyn Restored] POP Series 3 then put all cards exiled

then put all cards exiled with Knowledge Vault into their owner's hand

You may cast up to X instant and/or sorcery spells from among cards exiled this way without paying their mana costs

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {1} Mana Vault doesn't untap during your untap step

Moss-covered statues littered the area

Cavern of Souls [Avacyn Restored] POP Series 3 then put all cards exiledSet: Avacyn Restored Type: Land Rarity: Rare 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.