Youthful Valkyrie 
Creature — Angel
$0.17 #3065 0.13 5.6 years
Flying
Whenever another Angel you control enters, put a +1/+1 counter on this creature.
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Cards similar to Youthful Valkyrie 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.
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"Each other Angel you control enters with an additional +1/+1 counter on it for each Angel you already control."
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"Flying"
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$1.19↑#2263↑0.1114.3 years↑
"Whenever an Angel you control enters, you gain 1 life."
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$0.13↓#20632↓0.00↓11.1 years↑
"Flying"
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$0.25↑#6865↓0.072.8 years↓
"Flying"
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$0.31↑#29298↓0.1818.6 years↑
"Flying"
Umara Raptor74%
$0.14↓#17940↓0.00↓16.9 years↑
"Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature."
+1 more matching line
Aeronaut Cavalry74%
$0.07↓#24767↓0.00↓3.8 years↓
"Flying"
Scrounging Skyray74%
$0.26↑#7337↓0.131.6 years↓
"Flying"
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$0.27↑#9595↓0.063.0 years↓
"Flying"
Kilnmouth Dragon73%
$0.73↑#17391↓0.27↑23.6 years↑
"Flying"
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$0.24↑#25296↓0.00↓0.2 years↓
"Flying"
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"Flying"
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$0.45↑#12167↓0.28↑16.6 years↑
"Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature."