Cheapest priced copy (Duel Decks: Jace vs. Vraska): $0.35 at Card Kingdom, near mint, their price list as of .
River Boa 
Creature — Snake · 2/1 · Uncommon · World Championship Decks 1999 · #ml249
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate this creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
11 printings · $0.35 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Classic Sixth Edition | 249 | Uncommon | $0.59 | — |
| Battle Royale Box Set | 59 | Uncommon | $0.69 | — |
| Duel Decks: Jace vs. Vraska | 49 | Uncommon | $0.35 | — |
| Duels of the Planeswalkers | 80 | Uncommon | $0.35 | — |
| Friday Night Magic 2000 | 1 | Rare | — | $37.99 |
| The List | ZEN-180 | Uncommon | $0.35 | — |
| Salvat 2011 | 156 | Uncommon | — | — |
| Visions | 118 | Common | $0.35 | — |
| World Championship Decks 1997 | sg118sb | Common | $0.35 | — |
| World Championship Decks 1999 | ml249 | Uncommon | $0.35 | — |
| Zendikar | 180 | Uncommon | $0.35 | $2.99 |