Petravark 
Creature — Nightmare Beast
$0.20 #28153 0.44 24.6 years
When this creature enters, exile target land.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.
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Cards similar to Petravark 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.
Faceless Butcher99%
$0.17↓#16963↑0.24↓24.6 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Fiend Hunter99%
$0.09↓#3915↑0.20↓14.9 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Journey to Nowhere99%
$0.19↓#8682↑0.00↓16.9 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Leonin Relic-Warder98%
$0.21↑#7039↑0.17↓15.6 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Oblivion Ring97%
$0.18↓#4982↑0.33↓18.9 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Slithery Stalker96%
$0.17↓#274070.25↓24.6 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Wall of Nets95%
$5.78↑#13105↑0.4228.2 years↑
"When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control."
Petradon94%
$0.47↑#299510.19↓24.6 years
"When this creature enters, exile two target lands."
+1 more matching line
Realm Razer90%
$0.55↑#228751.21↑17.9 years↓
"When this creature enters, exile all lands."
+1 more matching line
Icy Prison88%
$0.43↑#282210.4031.3 years↑
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Savior of Ollenbock86%
$0.32↑#17882↑0.29↓4.8 years↓
"When this creature leaves the battlefield, put the exiled cards onto the battlefield under their owners' control."
Fear of Abduction86%
$0.17↓#18337↑0.13↓1.9 years↓
"When this creature enters, exile target creature an opponent controls."
+1 more matching line
Detention Sphere84%
$0.21↑#8366↑0.33↓13.9 years↓
"When this enchantment leaves the battlefield, return the exiled cards to the battlefield under their owner's control."
+1 more matching line
Faceless Devourer84%
$0.11↓#249310.33↓19.9 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Admonition Angel84%
$0.87↑#7956↑0.3516.6 years↓
"When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control."
+1 more matching line
Wormfang Behemoth82%
$0.23↑#301220.00↓24.3 years
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."
Mesmeric Fiend82%
$0.77↑#20343↑0.33↓24.6 years
"When this creature leaves the battlefield, return the exiled card to its owner's hand."
Tidehollow Sculler81%
$0.13↓#22133↑0.4017.9 years↓
"When this creature leaves the battlefield, return the exiled card to its owner's hand."
Wormfang Drake80%
$0.12↓#235610.00↓24.3 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Worldgorger Dragon79%
$1.53↑#5920↑0.95↑24.3 years
"When this creature leaves the battlefield, return the exiled cards to the battlefield under their owners' control."
+1 more matching line