Cheapest priced copy (Mercadian Masques): $0.69 at Card Kingdom, near mint, their price list as of .
Sand Squid 
Creature — Squid Beast · 2/2 · Rare · Mercadian Masques · #96
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
You may choose not to untap this creature during your untap step.
{T}: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.69 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mercadian Masques | 96 | Rare | $0.69 | $16.99 |