Rathi Dragon 
Creature — Dragon
$0.38 #31033 0.11 28.9 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, sacrifice it unless you sacrifice two Mountains.
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Cards similar to Rathi Dragon 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.
Lithophage92%
$0.32↓#311020.0726.9 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a Mountain."
Scythe Tiger91%
$0.13↓#267070.25↑16.9 years↓
"When this creature enters, sacrifice it unless you sacrifice a land."
Foul Spirit86%
$0.61↑#316250.0628.2 years
"When this creature enters, sacrifice a land."
Mogg Alarm84%
$0.23↓#18908↑0.00↓26.6 years↓
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Primeval Force84%
$0.23↓#304580.62↑29.3 years
"When this creature enters, sacrifice it unless you sacrifice three Forests."
Plant Elemental84%
$0.22↓#314510.00↓29.3 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Rogue Elephant84%
$0.18↓#300370.24↑29.2 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Zanam Djinn84%
$0.18↓#314330.00↓25.9 years↓
"Flying"
Dormant Volcano82%
$0.64↑#9285↑0.0929.6 years
"When this land enters, sacrifice it unless you return an untapped Mountain you control to its owner's hand."
Pulverize81%
$1.22↑#256940.39↑26.9 years↓
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Thunderclap81%
$0.19↓#15788↑0.29↑26.9 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Fireblast80%
$0.63↑#17291↑0.57↑29.6 years
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Downhill Charge80%
$0.26↓#12174↑0.0626.6 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Crash80%
$0.22↓#24063↑0.75↑26.9 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Mine Collapse80%
$0.16↓#13156↑0.32↑5.2 years↓
"If it's your turn, you may sacrifice a Mountain rather than pay this spell's mana cost."
Cosmic Larva79%
$0.36↓#19553↑0.29↑22.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice two lands."
Mold Demon78%
$17.78↑#313700.00↓32.3 years↑
"When this creature enters, sacrifice it unless you sacrifice two Swamps."
Bog Elemental76%
$0.25↓#303540.00↓26.3 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a land."
Cloudskate76%
$0.16↓#311940.25↑26.6 years↓
"Flying"
Jokulmorder75%
$0.56↑#24085↑0.0720.1 years↓
"When this creature enters, sacrifice it unless you sacrifice five lands."