Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
River Darter 
Creature — Merfolk Warrior · 2/3 · Common · Rivals of Ixalan · #47
This creature can't be blocked by Dinosaurs.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | RIX-47 | Common | $0.35 | — |
| Rivals of Ixalan | 47 | Common | $0.35 | $0.49 |