At the beginning of your upkeep, sacrifice this enchantment unless you pay .
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.
(01/08/2008)
A hybrid symbol that is both black and another type is a black mana symbol, regardless of what cost is paid for it.
(04/10/2004)
You have to sacrifice a Swamp for each black mana in the activation cost. If you use Pestilence with , that’s 4 activations with each so you sacrifice 4 Swamps.
(08/06/2016)
Activated abilities contain a colon. They’re generally written “Cost: Effect.” Some keywords are activated abilities and will have colons in their reminder text.
