Squealing Devil 

Creature — Devil
$0.16 #30211 0.57 20.3 years
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
When this creature enters, you may pay
. If you do, target creature gets +X/+0 until end of turn.
When this creature enters, sacrifice it unless
was spent to cast it.
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Cards similar to Squealing Devil 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.
Azorius Herald86%
$0.06↓#249720.22↓20.3 years
"When this creature enters, sacrifice it unless
was spent to cast it."
Patagia Viper85%
$0.06↓#23495↑0.44↓20.3 years
"When this creature enters, sacrifice it unless
was spent to cast it."
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$0.04↓#250760.21↓20.3 years
"When this creature enters, sacrifice it unless
was spent to cast it."
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$0.08↓#270850.41↓20.3 years
"When this creature enters, sacrifice it unless
was spent to cast it."
Plaxmanta78%
$0.09↓#18729↑0.38↓20.3 years
"When this creature enters, sacrifice it unless
was spent to cast it."
Gruul Scrapper74%
$0.06↓#312710.00↓21.0 years
"When this creature enters, if
was spent to cast it, it gains haste until end of turn."
Steamcore Weird72%
$0.04↓#302010.27↓20.6 years
"When this creature enters, if
was spent to cast it, it deals 2 damage to any target."
Tin Street Hooligan72%
$0.09↓#284390.06↓20.6 years
"When this creature enters, if
was spent to cast it, destroy target artifact."
Bone Pit Brute71%
$0.02↓#282960.00↓6.2 years↓
"When this creature enters, target creature gets +4/+0 until end of turn."
+1 more matching line
Friendly Ghost71%
$0.11↓#21796↑0.27↓1.9 years↓
"When this creature enters, target creature gets +2/+4 until end of turn."
Clockwork Servant71%
$0.06↓#23093↑0.29↓6.9 years↓
"When this creature enters, if at least three mana of the same color was spent to cast it, draw a card."