Cheapest priced copy (Shadowmoor): $0.49 at Card Kingdom, near mint, their price list as of .
Isleback Spawn 
Creature — Kraken · 4/8 · Rare · Shadowmoor · #40
Shroud (This creature can't be the target of spells or abilities.)
This creature gets +4/+8 as long as a library has twenty or fewer cards in it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Salvat 2011 | 40 | Rare | — | — |
| Shadowmoor | 40 | Rare | $0.49 | $3.49 |
One ruling from Wizards of the Coast
- 1 May 2008It doesn't matter which library has twenty or fewer cards in it, and you don't have to specify a library. If multiple libraries have twenty or fewer cards in them, Isleback Spawn will still get its bonus only once.