Whir of Invention (Borderless) [Aetherdrift Special Guests]

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          Description
          Set: Aetherdrift Special Guests
          Type: Instant
          Rarity: Mythic
          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.