Whir of Invention [Aether Revolt]Set: Aether Revolt Type: Instant Rarity: Rare Cost: {X}{U}{U}{U} Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.

Set: Diamond & Pearl: Base Set Type: Item Rarity: Uncommon

Set: Neo Destiny Unlimited Type: Grass Rarity: Holo Rare

Whenever you cast an enchantment spell

Set: EX: Dragon Frontiers Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Sun & Moon: Guardians Rising Type: Fighting Rarity: Secret Rare Retreat cost: Colorless

Set: EX: Power Keepers Type: Energy Rarity: Rare

Set: Team Rocket 1st Edition Type: Fighting Rarity: Rare Retreat cost: Colorless

Set: World Championships 2014 Type: Dragon Rarity: Ultra Rare Retreat cost: Colorless

Set: Sun & Moon: Unbroken Bonds Type: Darkness Rarity: Rare Retreat cost: Colorless

Set: EX: Emerald Type: Grass Rarity: Common Retreat cost: Colorless

Set: World Championships 2015 Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

Set: Diamond & Pearl: Stormfront Type: Psychic Rarity: Rare