Crypt Ghast 
Creature — Spirit
$12.63 #522 0.65 13.7 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%
$0.12↓#19157↓0.00↓13.7 years
"Extort"
Knight of Obligation96%
$0.19↓#21065↓0.15↓13.7 years
"Extort"
Tithe Drinker96%
$0.25↓#7449↓0.12↓13.5 years
"Extort"
Basilica Guards95%
$0.16↓#15717↓0.00↓13.7 years
"Extort"
Kingpin's Pet95%
$0.10↓#17901↓0.00↓13.7 years
"Extort"
Basilica Screecher95%
$0.21↓#7146↓0.00↓13.7 years
"Extort"
Syndic of Tithes92%
$0.13↓#15619↓0.38↓13.7 years
"Extort"
Nirkana Revenant90%
$7.45↓#2963↓0.37↓16.5 years↑
"Whenever you tap a Swamp for mana, add an additional ."
."
Life Insurance89%
$0.31↓#5955↓0.11↓4.5 years↓
"Extort"
Syndicate Heavy87%
$0.34↓#19512↓0.05↓2.7 years↓
"Extort"
Thrull Parasite86%
$0.28↓#7201↓0.00↓13.7 years
"Extort"
The Kingpin of Crime86%
$0.29↓#18227↓0.11↓0.3 years↓
"Extort"
Vizkopa Confessor86%
$0.27↓#23162↓0.11↓13.7 years
"Extort"
Blind Obedience85%
$4.83↓#5051.28↑13.7 years
"Extort"
Pontiff of Blight84%
$0.29↓#6044↓0.86↑13.5 years
"Extort"
Nikya of the Old Ways83%
$0.33↓#10750↓0.24↓7.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Treasury Thrull83%
$0.15↓#16964↓0.09↓13.7 years
"Extort"
Zendikar Resurgent80%
$2.60↓#2455↓0.38↓10.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Bubbling Muck80%
$2.75↓#2210↓0.45↓27.4 years↑
"Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional ."
."
Groundchuck & Dirtbag80%
$0.41↓#8597↓0.38↓0.6 years↓
"Whenever you tap a land for mana, add 
."
."