Cheapest priced copy (Tempest): $0.49 at Card Kingdom, near mint, their price list as of .
Benthic Behemoth 
Creature — Serpent · 7/6 · Rare · Tempest · #54
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $119.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Seventh Edition | 63 | Rare | $0.69 | — |
| Seventh Edition | 63★ | Rare | — | $119.99 |
| Tempest | 54 | Rare | $0.49 | — |