Whir of Invention
Instant
Classic, NearMint, 
#547 in Mystery Booster
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 converted mana cost X or less, put it onto the battlefield, then shuffle your library.
€1.99
Watchdog
Out of stock
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| Language | English |
|---|---|
| supertype | (not set) |
| type | Instant |
| subtype | (not set) |
| color | U |
| style | Classic |
| number | 547 |
| rarity | Rare |
| manacost | X U U U |
| condition | NearMint |
| power | (not set) |
| toughness | (not set) |
| artist | Christine Choi |
| layout | Regular |
| loyalty | (not set) |