Drought 


Enchantment
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.
click a line to search just that ability, click more to combine them
Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Justice 100%
$0.19#27313
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Conversion 100%
#26418
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Mangara's Equity 92%
$0.19#30364
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {1}{W}."
Glaciers 92%
$0.53#29193
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{U}."
Chromium 81%
#23813
"At the beginning of your upkeep, sacrifice this card unless you pay {W}{U}{B}."
Dark Triumph 81%
$0.31#23176
"If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost."