Day of the Dragons 
Enchantment
$0.18 #16931 0.12 23.3 years
When this enchantment enters, exile all creatures you control. Then create that many 5/5 red Dragon creature tokens with flying.
When this enchantment leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.
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Cards similar to Day of the Dragons 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 Drake84%
$0.12↓#23561↓0.00↓24.3 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Newt83%
$0.15↓#23916↓0.22↑24.3 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Turtle83%
$0.18#24161↓0.00↓24.3 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Worldgorger Dragon83%
$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."
Wormfang Crab77%
$0.26↑#22814↓0.00↓24.3 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Icy Prison76%
$0.43↑#28221↓0.40↑31.3 years↑
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Eager Glyphmage70%
$0.06↓#23658↓0.00↓0.4 years↓
"When this creature enters, create a 1/1 white and black Inkling creature token with flying."
Champions of the Perfect70%
$1.42↑#4256↑0.00↓0.6 years↓
"When this creature leaves the battlefield, return the exiled card to its owner's hand."