Cheapest priced copy (Born of the Gods): $0.35 at Card Kingdom, near mint, their price list as of .
Floodtide Serpent 
Creature — Serpent · 4/4 · Common · Born of the Gods · #41
This creature can't attack unless you return an enchantment you control to its owner's hand. (This cost is paid as attackers are declared.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 41 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 February 2014You must return an enchantment you control to its owner’s hand during each combat in which you attack with Floodtide Serpent.