![Whir of Invention [Mystery Booster] Year of the Tiger 2022 if it's on the battlefield](https://cdn.shopify.com/s/files/1/0895/3747/8943/files/e6e08ac3-d01a-53bc-ba9d-e5f54f3b5ac7.jpg?v=1737832249)
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if it's on the battlefield
provided you can procure a dragontooth to cut it
you may cast that card from exile without paying its mana cost
+1: Untap up to one target creature
If it's a creature
Whir of Invention [Mystery Booster] Year of the Tiger 2022 if it's on the battlefieldSet: 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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