Cheapest priced copy (Urza's Destiny): $0.35 at Card Kingdom, near mint, their price list as of .
Brine Seer 
Creature — Human Wizard · 1/1 · Uncommon · Urza's Destiny · #28
{2}{U}, {T}: Reveal any number of blue cards in your hand. Counter target spell unless its controller pays {1} for each card revealed this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Destiny | 28 | Uncommon | $0.35 | $4.49 |
One ruling from Wizards of the Coast
- 4 October 2004You can reveal zero cards, and the controller of the spell can pay {0} to stop this or not pay {0} and let it be countered.