Cheapest priced copy (Tarkir: Dragonstorm Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Ambling Stormshell 
Creature — Turtle · 5/9 · Rare · Tarkir: Dragonstorm · #37
Ward {2}
Whenever this creature attacks, put three stun counters on it and draw three cards. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Whenever you cast a Turtle spell, untap this creature.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 37p | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm Promos | 37s | Rare | — | $1.29Out of stock |
| Tarkir: Dragonstorm | 37 | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm | 332 | Rare | $0.49 | $0.49 |