Crypt Ghast 
Creature — Spirit
$12.64 #527 0.73 13.6 years
Extort (Whenever you cast a spell, you may pay 
. If you do, each opponent loses 1 life and you gain that much life.)
. If you do, each opponent loses 1 life and you gain that much life.)Whenever you tap a Swamp for mana, add an additional .
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Cards similar to Crypt Ghast 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.
Syndicate Enforcer96%
$0.11↓#18863↓0.00↓13.6 years
"Extort"
Knight of Obligation96%
$0.21↓#20924↓0.62↓13.6 years
"Extort"
Tithe Drinker96%
$0.27↓#7316↓0.00↓13.3 years
"Extort"
Kingpin's Pet95%
$0.15↓#17894↓0.30↓13.6 years
"Extort"
Basilica Guards95%
$0.19↓#15687↓0.30↓13.6 years
"Extort"
Basilica Screecher95%
$0.24↓#7004↓0.21↓13.6 years
"Extort"
Syndic of Tithes92%
$0.13↓#15648↓0.27↓13.6 years
"Extort"
Nirkana Revenant90%
$7.52↓#2896↓0.38↓16.4 years↑
"Whenever you tap a Swamp for mana, add an additional ."
."
Life Insurance89%
$0.29↓#5787↓0.31↓4.4 years↓
"Extort"
Syndicate Heavy87%
$0.43↓#19501↓0.35↓2.5 years↓
"Extort"
Thrull Parasite86%
$0.29↓#7031↓0.11↓13.6 years
"Extort"
The Kingpin of Crime86%
$0.30↓#19173↓0.00↓0.2 years↓
"Extort"
Vizkopa Confessor86%
$0.16↓#22978↓0.35↓13.6 years
"Extort"
Blind Obedience85%
$4.30↓#5001.15↑13.6 years
"Extort"
Zendikar Resurgent84%
$2.41↓#2336↓0.47↓10.6 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Pontiff of Blight84%
$0.26↓#5886↓0.39↓13.3 years
"Extort"
Nikya of the Old Ways83%
$0.37↓#10535↓0.50↓7.6 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Treasury Thrull83%
$0.13↓#16751↓0.27↓13.6 years
"Extort"
Bubbling Muck80%
$2.20↓#2262↓0.36↓27.2 years↑
"Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional ."
."
Groundchuck & Dirtbag80%
$0.41↓#9259↓0.00↓0.5 years↓
"Whenever you tap a land for mana, add 
."
."