Whir of Invention Tweet Out of stock. Wishlist Details Color: Blue Card Text: 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 converted mana cost X or less, put it onto the battlefield, then shuffle your library. Rarity: R Cost: XUUU Card Type: Instant Artist: Christine Choi Name: Whir of Invention Finish: Regular Card Number: 049/184 Set Name: Mystery Booster - Aether Revolt
