Forcefield [International Collectors' Edition] Magic 2013 if that spell's mana cost

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

Set: War of the Spark Promos Type: Legendary Planeswalker — Dovin Rarity: Uncommon Cost: {2}{W/U} Artifact

and even houses

Set: Portal Three Kingdoms Type: Legendary Creature — Human Rarity: Rare Cost: {1}{G}{G} {T}: Put target creature card from your graveyard on top of your library

Set: Friday Night Magic 2009 Type: Artifact — Equipment Rarity: Rare Cost: {2} Equipped creature has haste and shroud

Forcefield [International Collectors' Edition] Magic 2013 if that spell's mana costSet: International Collectors' Edition Type: Artifact Rarity: Rare Cost: {3} {1}: The next time an unblocked creature of your choice would deal combat damage to you this turn, prevent all but 1 of that damage.