Weeping Angel 
Artifact Creature — Alien Angel
$0.37 #9561 0.56 3.0 years
Flash
First strike, vigilance
Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn.
If this creature would deal combat damage to a creature, prevent that damage and that creature's owner shuffles it into their library.
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Cards similar to Weeping Angel 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.
Happy Hogan, Bodyguard82%
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"Vigilance"
+1 more matching line
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"When an opponent casts a creature spell, sacrifice this creature."
Enduring Curiosity76%
$5.89↑#825↑0.40↓2.1 years
"Flash"
Boon Satyr75%
$0.23↓#16944↓0.00↓13.1 years↑
"Flash"
Blink74%
$0.27↓#14304↓0.26↓3.0 years
"Create a 2/2 black Alien Angel artifact creature token with first strike, vigilance, and "Whenever an opponent casts a creature spell, this token isn't a creature until end of turn.""
Opal Acrolith72%
$0.26↓#30678↓0.00↓28.0 years↑
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Opal Caryatid72%
$0.10↓#30803↓0.13↓28.0 years↑
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature."
Minion's Return72%
$0.34↓#5661↑0.21↓6.7 years↑
"Flash"
Aether Sting71%
$0.43↑#15402↓0.00↓27.4 years↑
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Observant Alseid70%
$0.08↓#21751↓0.00↓13.1 years↑
"Vigilance"
Pouncing Shoreshark70%
$0.21↓#7079↑0.19↓6.5 years↑
"Flash"
Voracious Greatshark70%
$0.17↓#12346↓0.06↓6.5 years↑
"Flash"
Opal Champion70%
$0.10↓#30797↓0.00↓27.7 years↑
"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 3/3 Knight creature with first strike."
Vedalken Dismisser70%
$0.06↓#29952↓0.12↓21.2 years↑
"When this creature enters, put target creature on top of its owner's library."