Cheapest priced copy (Tenth Edition): $2.99 at Card Kingdom, near mint, their price list as of .
Citanul Flute 
Artifact · Rare · Urza's Saga · #289
{X}, {T}: Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $2.99 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 315 | Rare | $2.99 | $24.99 |
| Urza's Saga | 289 | Rare | $2.99 | — |
2 rulings from Wizards of the Coast
- 4 October 2004X can be zero if you want.
- 4 October 2004You look in your library but you do not have to choose a creature even if you have one that meets the criteria.