Molting Harpy {B}
Creature — Harpy Mercenary
Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {2}.
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.
Draco 89%
$3.75#9905
"At the beginning of your upkeep, sacrifice this creature unless you pay {10}. This cost is reduced by {2} for each basic land type among lands you control."
Endless Wurm 86%
$1.99#26828
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Razormane Masticore 85%
$0.21#26753
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 85%
$0.39#29145
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Masticore 85%
#24663
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Extravagant Spirit 85%
$0.36#31505
"At the beginning of your upkeep, sacrifice this creature unless you pay {1} for each card in your hand."
Eldrazi Monument 84%
$9.84#1430
"At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact."
Reclusive Wight 84%
$0.20#31015
"At the beginning of your upkeep, if you control another nonland permanent, sacrifice this creature."
Doomgape 83%
$0.21#18938
"At the beginning of your upkeep, sacrifice a creature. You gain life equal to that creature's toughness."
Liege of the Pit 83%
$0.69#16287
"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
Lord of the Pit 83%
$0.44#12864
"At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you."
Phantasmal Forces 82%
#30887
"At the beginning of your upkeep, sacrifice this creature unless you pay {U}."
+1 more matching line
Drifter il-Dal 82%
$0.05#25456
"At the beginning of your upkeep, sacrifice this creature unless you pay {U}."