Cheapest priced copy (Ice Age): $0.35 at Card Kingdom, near mint, their price list as of .
Drought 
Enchantment · Uncommon · Ice Age · #21
At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}.
Spells cost an additional "Sacrifice a Swamp" to cast for each black mana symbol in their mana costs.
Activated abilities cost an additional "Sacrifice a Swamp" to activate for each black mana symbol in their activation costs.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ice Age | 21 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 4 October 2004You have to sacrifice a Swamp for each black mana in the activation cost. If you use Pestilence with {B}{B}{B}{B}, that’s 4 activations with {B} each so you sacrifice 4 Swamps.
- 1 August 2008A hybrid symbol that is both black and another type is a black mana symbol, regardless of what cost is paid for it.
- 8 June 2016Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.