Verdant Catacombs [Modern Horizons 2] Collectors' Edition if that spell's mana cost

if that spell's mana cost or that ability's activation cost contains {X}

Set: Diamond & Pearl: Legends Awakened Type: Colorless Rarity: Rare Retreat cost: Colorless

Set: Shadows over Innistrad Prerelease Promos Type: Sorcery Rarity: Mythic Cost: {4}{G}{G} Return any number of cards with different mana values from your graveyard to your hand

Set: World Championships 2008 Type: Psychic Rarity: Common Retreat cost: Colorless

treacherous drops

Verdant Catacombs [Modern Horizons 2] Collectors' Edition if that spell's mana costSet: Modern Horizons 2 Type: Land Rarity: Rare {T}, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.