At the beginning of your upkeep, sacrifice Drought 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.
During your upkeep, pay oWoW or destroy Drought. Before a spell that requires oB as part of its casting cost may be cast or an ability that requires oB as part of its activation cost may be played, the controller of that spell or ability sacrifices a swamp for each oB in the spell's casting cost or the ability's activation cost.
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