Cheapest priced copy (Ice Age): $0.35 at Card Kingdom, near mint, their price list as of .
Sleight of Mind 
Instant · Rare · 30th Anniversary Edition · #375
Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
14 printings · $0.35 to $799.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 79 | Rare | $27.99 | — |
| 30th Anniversary Edition | 78 | Rare | $20.99 | — |
| 30th Anniversary Edition | 375 | Rare | $199.99 | — |
| Revised Edition | 81 | Rare | $0.99 | — |
| Fourth Edition Foreign Black Border | 102 | Rare | — | — |
| Fourth Edition | 102 | Rare | $0.49 | — |
| Fifth Edition | 124 | Rare | $0.49 | — |
| Collectors' Edition | 79 | Rare | $5.49Out of stock | — |
| Intl. Collectors' Edition | 79 | Rare | $8.99Out of stock | — |
| Foreign Black Border | 81 | Rare | — | — |
| Ice Age | 99 | Uncommon | $0.35 | — |
| Limited Edition Alpha | 78 | Rare | $799.99 | — |
| Limited Edition Beta | 79 | Rare | $179.99 | — |
| Summer Magic / Edgar | 81 | Rare | — | — |
10 rulings from Wizards of the Coast
- 4 October 2004Can’t change a color word to the same color word. It must be a different word.
- 4 October 2004Can target a card with no color words on it.
- 4 October 2004You choose the words to change on resolution.
- 4 October 2004It can’t change a word to the same word. It must be a different word.
- 4 October 2004It only changes what is printed on the card (or set on a token when it was created or set by a copy effect). It will not change any effects that are on the permanent.
- 4 October 2004Can target a card with no appropriate words on it, or even one with no words at all.
- 4 October 2004If you change the text of a spell which is to become a permanent, the permanent will retain the text change until the effect wears off.
- 4 October 2004Alters all occurrences of the chosen word in the text box and the type line of the given card.
- 4 October 2004You can’t Sleight proper nouns (i.e. card names). This means that you can’t affect a “Black Vise”.
- 4 October 2004Changing the text of a spell will not allow you to change the targets of the spell because the targets were chosen when the spell was cast. The text change will (probably) cause it to be countered since the targets will be illegal.