Icy Prison 
Enchantment
$0.46 #28579 0.29 31.4 years
When this enchantment enters, exile target creature.
At the beginning of your upkeep, sacrifice this enchantment unless any player pays 
.
.When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control.
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Cards similar to Icy Prison 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.
Wormfang Turtle95%
$0.18↓#241510.11↓24.4 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Newt95%
$0.17↓#237860.00↓24.4 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Drake94%
$0.13↓#238980.05↓24.4 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Worldgorger Dragon94%
$1.41↑#6040↑0.61↑24.4 years↓
"When this creature leaves the battlefield, return the exiled cards to the battlefield under their owners' control."
Journey to Nowhere90%
$0.20↓#8858↑0.05↓17.0 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Faceless Butcher90%
$0.19↓#17184↑0.07↓24.7 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Fiend Hunter90%
$0.07↓#3912↑0.2615.1 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Wormfang Crab88%
$0.28↓#231740.00↓24.4 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Petravark88%
$0.19↓#284500.3324.7 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Leonin Relic-Warder86%
$0.22↓#7226↑0.13↓15.7 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Oblivion Ring86%
$0.17↓#5113↑0.56↑19.0 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Detention Sphere86%
$0.20↓#8510↑0.75↑14.0 years↓
"When this enchantment leaves the battlefield, return the exiled cards to the battlefield under their owner's control."
Fear of Abduction86%
$0.14↓#18903↑0.16↓2.1 years↓
"When this creature enters, exile target creature an opponent controls."
+1 more matching line
Faceless Devourer86%
$0.10↓#249810.06↓20.0 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line
Helvault86%
$0.25↓#22143↑0.00↓14.7 years↓
"When this card is put into a graveyard from the battlefield, return all cards exiled with it to the battlefield under their owners' control."
+1 more matching line
Slithery Stalker85%
$0.26↓#278630.09↓24.7 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%
$0.96↑#7944↑0.3316.7 years↓
"When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control."
Wall of Nets84%
$5.64↑#13088↑0.39↑28.3 years↓
"When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control."
Stasis Snare84%
$0.10↓#11821↑0.13↓11.0 years↓
"When this enchantment enters, exile target creature an opponent controls until this enchantment leaves the battlefield."
Realm Razer84%
$0.52↑#232981.35↑18.0 years↓
"When this creature leaves the battlefield, return the exiled cards to the battlefield tapped under their owners' control."