Ash Barrens (Surge Foil) [Doctor Who] Urza’s Power-Plant if that spell's mana cost

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

On the bright side

Set: Portal Second Age Type: Creature — Dragon Rarity: Rare Cost: {6}{R}{R} Flying

Art by Ed Repka

Set: Secret Lair Drop Series Type: Enchantment Rarity: Rare Cost: {2}{W} Whenever an opponent casts their second spell each turn

Ash Barrens (Surge Foil) [Doctor Who] Urza’s Power-Plant if that spell's mana costSet: Doctor Who Type: Land Rarity: Uncommon {T}: Add {C}. Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.) "Look at the trees. Not a trace of foliage. The very bark stripped from the trunks. And the soil, barren." The Sixth Doctor