Cheapest priced copy (Fourth Edition): $0.49 at Card Kingdom, near mint, their price list as of .
Thoughtlace 
Instant · Rare · 30th Anniversary Edition · #379
Target spell or permanent becomes blue. (Mana symbols on that permanent remain unchanged.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
12 printings · $0.49 to $549.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 83 | Rare | $8.49 | — |
| 30th Anniversary Edition | 82 | Rare | $29.99 | — |
| 30th Anniversary Edition | 379 | Rare | $229.99 | — |
| Revised Edition | 85 | Rare | $0.69 | — |
| Fourth Edition Foreign Black Border | 107 | Rare | — | — |
| Fourth Edition | 107 | Rare | $0.49 | — |
| Collectors' Edition | 83 | Rare | $2.99 | — |
| Intl. Collectors' Edition | 83 | Rare | $3.49Out of stock | — |
| Foreign Black Border | 85 | Rare | — | — |
| Limited Edition Alpha | 82 | Rare | $549.99 | — |
| Limited Edition Beta | 83 | Rare | $64.99 | — |
| Summer Magic / Edgar | 85 | Rare | — | — |