Whir of Invention
[Mystery Booster ]

$3.60 -1 in stock.
 
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Blue Commander Duel Explorer Gladiator Historic Instant Legacy Modern Mystery Booster Normal Oathbreaker Pioneer Rare Timeless Vintage
    Set: Mystery Booster
    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.
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