Cheapest priced copy (Visions): $0.99 at Card Kingdom, near mint, their price list as of .
Blanket of Night 
Enchantment · Uncommon · Visions · #52
Each land is a Swamp in addition to its other land types.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Visions | 52 | Uncommon | $0.99 | — |
8 rulings from Wizards of the Coast
- 4 October 2004Anything which counts the number of Swamps on the battlefield will not double count an actual Swamp card while Blanket of Night is on the battlefield.
- 4 October 2004The land can now be tapped for black mana in addition to any other abilities it already has. This works just as if the text “{T}: Add {B}” was added to each mana-producing land. In other words, the land can be tapped for its own ability _or_ it can be tapped for black mana. Not both.
- 4 October 2004It can affect lands which do not produce mana.
- 4 October 2004The ability is a land type change effect so it is ordered along with other land type change effects in the order they entered the battlefield.
- 4 October 2004More than one Blanket of Night has no meaningful additional effect.
- 4 October 2004Whether the land is a basic land or not is unchanged by this effect.
- 4 October 2004The lands do not get the name “Swamp” in addition to their current name. This is a reversal of older rulings.
- 15 October 2006If this effect is applied to a snow land, the land is now a snow Swamp and not just a regular Swamp.