Whir of Invention
[Secret Lair: Heads I Win, Tails You Lose ]

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Blue Brawl Commander Duel Explorer Gladiator Historic Instant Legacy Modern Normal Oathbreaker Pioneer Rare Secret Lair: Heads I Win Tails You Lose Timeless Vintage

Description

Set:	Secret Lair: Heads I Win, Tails You Lose
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.