Whir of Invention [Aether Revolt Prerelease Promos] 043 If the player does

If the player does

Set: Sun & Moon: Burning Shadows Type: Fire Rarity: Secret Rare Retreat cost: Colorless

Set: Mirrodin Type: Artifact Creature — Angel Rarity: Rare Cost: {7} Flying

• 1 Secluded Steppe

Set: XY: Ancient Origins Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Whir of Invention [Aether Revolt Prerelease Promos] 043 If the player doesSet: Aether Revolt Prerelease Promos 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.