Whir of Invention 49 (The List Reprints)
NM
$7.55
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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.
Whir of Invention 49 (The List Reprints)
$7.55