Cheapest priced copy (Zendikar): $0.35 at Card Kingdom, near mint, their price list as of .
Gomazoa 
Creature — Jellyfish · 0/3 · Uncommon · Commander 2011 · #48
Defender, flying
{T}: Put this creature and each creature it's blocking on top of their owners' libraries, then those players shuffle.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2011 | 48 | Uncommon | $0.49 | — |
| Zendikar | 46 | Uncommon | $0.35 | $0.99 |
2 rulings from Wizards of the Coast
- 1 October 2009Gomazoa’s ability can be activated any time its controller has priority. It doesn’t need to be blocking any creatures.
- 1 October 2009If Gomazoa isn’t blocking a creature at the time its ability resolves, only Gomazoa is put on top of its owner’s library, and only that player shuffles their library.