Cheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Sea Serpent 
Creature — Serpent · 5/5 · Common · 30th Anniversary Edition · #373
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
13 printings · $0.35 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 77 | Common | $0.99 | — |
| 30th Anniversary Edition | 76 | Common | $0.99 | — |
| 30th Anniversary Edition | 373 | Common | $34.99 | — |
| Revised Edition | 78 | Common | $0.35 | — |
| Fourth Edition Foreign Black Border | 98 | Common | — | — |
| Fourth Edition | 98 | Common | $0.35 | — |
| Fifth Edition | 118 | Common | $0.35 | — |
| Collectors' Edition | 77 | Common | $1.29 | — |
| Intl. Collectors' Edition | 77 | Common | $1.49 | — |
| Foreign Black Border | 78 | Common | — | — |
| Limited Edition Alpha | 76 | Common | $24.99 | — |
| Limited Edition Beta | 77 | Common | $5.99Out of stock | — |
| Summer Magic / Edgar | 78 | Common | — | — |