Cheapest priced copy (Lorwyn): $0.35 at Card Kingdom, near mint, their price list as of .
Streambed Aquitects 
Creature — Merfolk Scout · 2/3 · Common · Lorwyn · #91
{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)
{T}: Target land becomes an Island until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Merfolk vs. Goblins | 18 | Common | $0.49 | — |
| Lorwyn | 91 | Common | $0.35 | $0.99 |