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Card Details
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.
Illustrated by NéNé Thomas
Rulings (3)
Oct 4, 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.
Aug 1, 2008
A hybrid symbol that is both black and another type is a black mana symbol, regardless of what cost is paid for it.
Jun 8, 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.