![Whir of Invention [Mystery Booster]](https://www.cardgametoponline.com/wp-content/uploads/2026/07/whir-invention-mystery-booster.webp)
Description
| 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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