Whir of Invention [Aether Revolt Prerelease Promos] XY106 allowed Shu forces to advance

allowed Shu forces to advance through forty-five Riverlands strongpoints with no casualties

Set: Urza's Saga Type: Artifact Rarity: Uncommon Cost: {0} {1}

Set: XY: Fates Collide Type: Stadium Rarity: Uncommon

Limit one per purchase

Whir of Invention [Aether Revolt Prerelease Promos] XY106 allowed Shu forces to advanceSet: 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.