Cheapest priced copy (The Dark): $0.35 at Card Kingdom, near mint, their price list as of .
Deep Water 
Enchantment · Common · The Dark · #23
{U}: Until end of turn, if you tap a land you control for mana, it produces {U} instead of any other type.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Dark | 23 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 4 October 2004Deep Waters affects lands you control when it resolves and any lands you gain control of this turn.
- 1 August 2008The amount of mana produced is unchanged, but it will all be {U}.