Doubling Season (Toppers) [Double Masters] Urza's Power-Plant If that mana is spent

If that mana is spent on an instant or sorcery spell

Set: Foreign Black Border Type: Instant Rare Cost: {U} Change the text of target spell or permanent by replacing all instances of one basic land type with another

{0}: Sacrifice Knowledge Vault

Set: Fate Reforged Promos Type: Instant Rarity: Rare Cost: {4}{U}{U} Return target creature to its owner's hand

Doubling Season (Toppers) [Double Masters] Urza's Power-Plant If that mana is spentSet: Double Masters Type: Enchantment Rarity: Mythic Cost: {4}{G} If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.