Thornmantle Striker 
Creature — Elf Rogue
$0.21 #22530 0.41 5.6 years
When this creature enters, choose one —
• Remove X counters from target permanent, where X is the number of Elves you control.
• Target creature an opponent controls gets -X/-X until end of turn, where X is the number of Elves you control.
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Cards similar to Thornmantle Striker 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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"
, Discard an Elf card: Target creature gets -X/-X until end of turn, where X is the number of Elves you control."
, Discard an Elf card: Target creature gets -X/-X until end of turn, where X is the number of Elves you control."
Blitz Leech79%
$0.10↓#255110.366.4 years
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn. Remove all counters from that creature."
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"When this creature enters, choose one —"
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"When this creature enters, choose one —"
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"• Target creature an opponent controls gets -X/-X until end of turn, where X is the mana value of the exiled card."
+1 more matching line
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$0.33↑#3752↑0.71↑2.2 years↓
"Choose one or more —"
Gloom Ripper76%
$0.27↑#11933↑0.00↓0.6 years↓
"When this creature enters, target creature you control gets +X/+0 until end of turn and up to one target creature an opponent controls gets -0/-X until end of turn, where X is the number of Elves you control plus the number of Elf cards in your graveyard."
Render Inert76%
$0.21#200880.59↑3.4 years↓
"Remove up to five counters from target permanent."
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"When this creature enters, you may remove a counter from target permanent."
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"When this creature enters, choose one —"
Trufflesnout75%
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"When this creature enters, choose one —"
Shambling Ghast74%
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"• Target creature an opponent controls gets -1/-1 until end of turn."
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"• Remove up to three counters from target permanent."
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"When this creature enters, choose one —"
Adaptive Sporesinger73%
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"When this creature enters, choose one —"
Orcus, Prince of Undeath73%
$0.35↑#8479↑0.475.1 years
"When this card enters, choose one —"