Cavern of Souls [The List] Oko Set: The List Type: Enchantment

Set: The List Type: Enchantment Rarity: Mythic Cost: {W} At the beginning of your upkeep

Set: Beta Edition Type: Instant Rarity: Common Cost: {U} You may tap or untap target artifact

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Draw four cards

Set: Legends Type: Legendary Creature — Human Assassin Rarity: Rare Cost: {2}{U}{U}{B}{B} {T}: Destroy target enchanted creature

or play as an intelligent cat in any fantasy campaign

Cavern of Souls [The List] Oko Set: The List Type: EnchantmentSet: The List 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.