Rathi Dragon 
Creature — Dragon
$0.40 #31378 0.00 29.0 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%
$0.14↓#314140.0027.0 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a Mountain."
Foul Spirit89%
$0.52↑#319700.0528.3 years
"When this creature enters, sacrifice a land."
Scythe Tiger88%
$0.15↓#271280.0017.0 years↓
"When this creature enters, sacrifice it unless you sacrifice a land."
Primeval Force84%
$0.22↓#307410.12↑29.5 years
"When this creature enters, sacrifice it unless you sacrifice three Forests."
Plant Elemental84%
$0.33↓#317920.0029.5 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Rogue Elephant84%
$0.19↓#303270.0529.4 years
"When this creature enters, sacrifice it unless you sacrifice a Forest."
Mogg Alarm83%
$0.23↓#19224↑0.0026.7 years↓
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Mold Demon82%
$17.95↑#316430.11↑32.4 years↑
"When this creature enters, sacrifice it unless you sacrifice two Swamps."
Dormant Volcano82%
$0.64↑#9341↑0.0429.7 years
"When this land enters, sacrifice it unless you return an untapped Mountain you control to its owner's hand."
Pulverize80%
$1.33↑#259480.26↑27.0 years↓
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Thunderclap80%
$0.18↓#15938↑0.0027.0 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Fireblast80%
$0.79↑#17545↑0.14↑29.7 years
"You may sacrifice two Mountains rather than pay this spell's mana cost."
Crash80%
$0.23↓#24310↑0.30↑27.0 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Cosmic Larva79%
$0.38↓#19799↑0.12↑22.4 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice two lands."
Downhill Charge78%
$0.28↓#12393↑0.14↑26.7 years↓
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Mine Collapse78%
$0.19↓#13344↑0.005.3 years↓
"If it's your turn, you may sacrifice a Mountain rather than pay this spell's mana cost."
Jokulmorder75%
$0.60↑#24405↑0.0520.2 years↓
"When this creature enters, sacrifice it unless you sacrifice five lands."
Bog Elemental74%
$0.28↓#306810.24↑26.4 years↓
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice a land."
Wand of the Elements74%
$0.36↓#306330.56↑22.7 years↓
"
, Sacrifice a Mountain: Create a 3/3 red Elemental creature token."
, Sacrifice a Mountain: Create a 3/3 red Elemental creature token."
Quickling74%
$0.36↓#7755↑0.0012.3 years↓
"Flying"